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ALEPH: Astronomy Precision Instruments & Technologies |
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Home > Intro > Prodotti e Servizi > Rifrattori > Rifrattori AT |
Home > Intro > Products & Services > Refractors > AT Refractors |
| Rifrattori Astronomy Technologies | Astronomy Technologies Refractors |
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Rifrattore Astrografo 90mm apocromatico tripletto ED |
Instrument's parameters to be verified on future batches |
90mm ED Triplet APO refractor / Astrograph |
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- Tripletto apocromatico a contatto con elemento centrale ED (FPL53) 90mm F=600mm (f/6.67) - cella collimabile - focheggiatore con riduzione micrometrica 1:11; diametro libero 85mm con riduzione 2" e 1.25" (con anelli di serraggio perimetrale); focheggiatore rotabile per orientare il sensore e comporre il soggetto. Corsa 140mm; mpomello per bloccaggio fuoco. - paraluce scorrevole, valigia rigida con imbottitura per il trasporto Alrtissimo livello esecutivo di ottica e meccanica: unostrimento progettato per fornire senza compromessi altissimi livelli prestazionali nelle appicazioni fotografiche e visuali più critiche.
Peso: 5.5 kg;
Disponibili anelli con cerniera HD CNC |
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- 90mm f/6.67
fully multicoated triplet apochromatic optics using an FPL-53
ED element That the performance of this Astro-Tech triplet apochromatic refractor is superb shouldn’t surprise you. Astro-Tech has quickly developed a well-deserved reputation for producing superlative small optics. However, what might surprise you is the more-than-reasonable price of this exceptional 90mm mid-sized refractor. Knowledgeable astronomers have “known" for years that you couldn’t get a true FPL-53 triplet apochromatic optical system with a collimatable lens cell in this size/focal ratio range for anywhere near this price. With this new AT90EDT, Astro-Tech is happy to prove those doubters wrong. The result is best quality images – images that are essentially totally color-free, despite the fast focal ratio, even at very high magnifications.
Those exceptional optics are even more impressive when you consider the package they come in. The finely-machined scope has a dual speed 2.7" rack-and-pinion focuser with a microfine 11:1 fine-focusing ratio. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. The supplied 2" and 1.25" eyepiece holders use non-marring brass compression rings. AT90EDT has a retractable lens shade and comes in a locking aluminum-frame carrying case.
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Rifrattore Apocromatico doppietto ED 66mm |
66mm ED doublet apochromatic refractor |
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La nuova serie di apocromatici Astronomy Technologies introduce strumenti di eccellente qualità meccanica ed ottica con elevati gradi di finitura. Il modello 66mm (focale 400mm) impiega un doppietto con vetro ED (Extremely Low Dispersion) FPL51. Quat'ottica apocromatica è ospitata in un tubo in alluminio di forte spessore con diaframa ricavati CNC, paraluce scorrevole, tappo in alluminio, finitura anodizzata lucida (disponibili diversi colori), e focheggiatore Crayford rotabile indipendentemente dal corpo (con meccanismo di serraggio perimetrale) e riduttore 1:11. Il barilotto è standard 1.25", con il puls di un filetto T che permette di utilizzare prontamente questo spotter come teleobiettivo di alta qualità per le riprese naturaiestiche e l'imaging astronomico. Styaffa per treppiede fotografico rimovibile, disponibili anelli per montature astronomiche. Fornito in valigia rigida di alluminio con imbottitura sagomata. Ogni singolo esemplare vien everificato da montato: la garanzia è accompagnata da un attestato che garantisce il Pss sui controlli de: - figura di diffrazione ad alto ingrandimento - Collimazione - meccanica focheggiatore e sistema di rotazione dello stesso per orientare il corpo macchina/diagonale rispetto al tubo ottico - finitura
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High performing 66mm f=400mm apochromatic refractor. High quality body construction,: sliding shield, all parts are aluminum made, heavy gauge body with inside CNC light baffles, Crayford focuser with 1:11 reducer. Focuser can be rotated indipendently from OTA, and it is locked with a perimetral blocking system. maximum performances, at theoretical limits. Free color views and images, overall high quality allows best performances both in terrestrial and astronomical visual and imaging uses.
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Rifrattore Apocromatico doppietto ED 80mm |
80mm ED Apochromat Refractor |
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Analoghe caratteristiche del modello 66mm, ma su una scala più grande.
L'obiettivo è costituito da un doppietto Apocromatico (spaziato in aria con vetro ED FPL 51) di ultima generazione: le immagini non presentano traccia di colore secondario, incisione e resa del dettagio sono elevatissimi: questo telescopio è perfetto per impieghi fotovisuali di alto livello, con prestazioni elevate sia in alta risoluzione, sia nelle osservazioni e nell'imaging a grande campo (anche su sensori allo stato solido con pixel di piccole dimensioni). Ad un'ottica di elevate prestaizoni si accmpagna una meccanica di alto livello: diaframmi interni lavorati CNC, focheggiatore Crayford con movmentoo micrometrico e pista graduata di riferimento ; il focheggiatore è orientabile per comporre l'immagne sul sensore o per orientare il diagonale e l'oculare in posizione confortevole, e presenta anello di serraggio perimetrale per ospitare con sicurezza gli accessori da 2" (o da 1.25" con l'annesso riduttore, pure con anello di serraggio perimetrale); paraluce scorrevole, staffa per treppiede fotografico con sezione trapezoidale compatibile per innesto anche su culla Vixen.
Abbiamo trovato qesto telescopio fondamentalmente non miglioorabile per prestazioni ed esecuzione.
Doametro 80mm, focale 550mm, trattamento a/r multistrato su tutte le superfici aria/vetro, finitura anodizzata lucida. In dotazione tappi in metallo, riduttore 2" - 1.25" con anello di serraggio perimetrale, bauletto rigido con imbottitura presagomata. |
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Rifrattore semiapo 80mm f/6 |
SemiApo 80mm refractor 80mm f/6 |
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L'AT80 ripropone le dimensioni e i criteri costruttivi di alto livello dell'AT Apocromatico, ed è maggiormente indicato per impieghi visuali e come travel scope. Paraluce scorrevole, diaframmi interni antiglare lavorati CNC, tubo ottico in finitura lucida, focheggiatore Crayford da 2" con anello di ritegno perimetrale e orientabile indipendentemente dal tubo ottico. In dotazione valigetta imbottita e riduttore 1.25" con anello di ritegno perimetrale. La staffa (sganciabile) ha filetto con passo per treppiede fotografico e presenta profilo trapezoidale per essere inserita anche su culla tipo Vixen. L'ottica spaziata in aria e con trattamento a/r multistrato è di alta qualità: questo strumento è adatta ad usi fotovisuali, con correzione nettamente superiore a quella di modeli di importazione. |
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AT 80mm EDT tripletto |
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Disponibili:
Versione con tubo in alluminio Versione con tubo in Fibra di Carbonio
Ottica: tripletto 80mm fovcale 560mm (f/7) fully multi coated (trattato a/rsu tutte le superfici aria/vetro) con elemento in vetro ED della O-Hara. Massima correzione cromatica e delle aberrazioni residue.
Focheggiatore 2" con riduttore 1.25" (entrambi con anello di serraggio perimetrale) a manovra con riduzione micrometrica planetaria 1:10; corsa 80mm.
Paraluce retraibile con blocco in posizione.
Anelli in alluminio HD compresi per montaggio su barra coda di rondine e su supporto.
Prestazioni elevate per gli impieghi più critici sia in visuale che nell'imaging.
Contattateci per conoscere disponibilità e nostra migliore offerta.
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This Astro-Tech
AT80EDT refractor has:
• 80mm f/7
fully multicoated triplet apochromatic optics using an ED
element and all Ohara glass Astro-Tech uses only premium Ohara glass and state-of-the-art optical multicoatings in the apochromatic ED triplet optics of the AT80EDT. This results in images that are essentially totally free of the annoying halo of unfocused violet light (chromatic aberration) that mars the bright-object images of lesser scopes, despite the fast focal ratio, and even at very high magnifications. These exceptional Astro-Tech optics are even more impressive when you consider the package they come in. The Astro-Tech AT80EDT has an advanced light weight/high strength carbon fiber body and dew shield. Carbon fiber is the material being used for most of the body structure of the new Boeing 787 Dreamliner passenger jet, so you know that carbon fiber has an outstanding strength to weight ratio. The Astro-Tech AT80EDT has a dual speed 2" Crayford focuser with a microfine 10:1 fine-focusing ratio. The supplied 2" and 1.25" eyepiece holders use non-marring brass compression rings that won’t scratch your star diagonal or eyepiece barrels. The AT80EDT has a retractable carbon fiber lens shade with a lock knob and comes in a locking aluminum-frame hard carrying case. It has dual split mounting rings that fit directly onto a wide variety of German astronomical mounts. This feature-laden 80mm Astro-Tech AT80EDT ED triplet apochromatic refractor is priced hundreds of dollars less than competitive 80mm triplet scopes – and even less than many competitive doublet systems! At the sensationally low price for an apochromatic triplet in a state-of-the-art carbon fiber body, and for the exceptional performance you get, the AT80EDT is surely one of the best buys in the astronomy! Features of this Telescope . . . ED apochromatic triplet refractor optics: 80mm (3.1") aperture, 560mm focal length, f/7 focal ratio three-lens optical system using an ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. All three lens elements are precision ground and polished under computer control from the finest quality Ohara glass. Ohara is well-known as Japan’s premier manufacturer of specialized optical glass. Fully multicoated optics: The AT80EDT triplet objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It’s a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye. Internal light baffles: Contrast-enhancing knife-edge light baffles and a specially darkened tube interior provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast. Dew shield: A self-storing retractable carbon fiber dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as a neighbor’s backyard security light. The tube measures a compact 19" long with the dew shield retracted. A lock knob built into the dew shield lets you lock the firmly in place so it can’t slip while aiming at the zenith. Dual speed microfine 2" Crayford-style focuser: The precision-made no-backlash focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical 35mm or CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. A knob underneath the focuser lets you adjust the tension on the drawtube to accommodate varying eyepiece/photo accessory loads. Long focuser travel: The long 80mm (3.1") travel focuser drawtube helps keep the overall scope length as short as practicable for convenient travel and storage. The tube measures only 19" long with the lens shade retracted, and 22" long with it extended. The long focuser drawtube length also permits switching between visual or photographic use with no add-on extension tubes needed. The drawtube has a scale marked in centimeters subdivided in 1mm increments and in inches subdivided in 1/16th inch increments. This lets you note individual focuser positions for easy return to the correct focus when switching between visual use and photography. A lock knob underneath the focuser lets you lock in your photographic focus.
Compression ring eyepiece holders: The focuser’s drawtube terminates
in a 2" eyepiece holder that uses a non-marring soft brass
compression ring to hold a 2" star diagonal and/or accessories in
place. The compression ring won’t scratch the barrel of your star
diagonal and accessories as an ordinary thumbscrew can. Tube finish: The optical tube and lens shade of the AT80EDT are made of a high strength woven carbon fiber cloth encapsulated in a transparent high gloss epoxy. This space-age material trims nearly a pound off the weight of the AT80EDT’s aluminum tube predecessor. The herringbone weave of the carbon fiber cloth is easily seen through its clear epoxy coating. The narrow alternating light and dark stripes of the weave seem to reverse their shades from light to dark and back again as you move the tube. The carbon fiber cloth is laid down by hand during the manufacturing process, so a subtle seam along the length of the tube is typically visible where the edges of the herringbone weave cloth meet. The focuser and metal trim are black anodized. Mounting rings: The AT80EDT has two 90mm felt-lined hinged split mounting rings to allow you to install the scope on any of a number of German equatorial mounts directly, or on a telescope mount dovetail plate, such as one of those from Losmandy or Vixen. The rings are drilled and tapped with 1/4"-20 thread holes on the top as well as the bottom so you can mount an accessory plate on top of the AT80EDT. Shipping/storage
case: The scope comes in a locking 23.5" x 7.5" x 9" aluminum-frame
foam-lined hard case with carry handle. Two year warranty: As an expression of the confidence Astronomy Technologies has in the quality of their products, the Astro-Tech AT80EDT triplet apo is protected by a two-year limited warranty against flaws in materials and workmanship (shipping case excluded).
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AT 102 ED Feathertouch |
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Prestazioni ottiche avanzate (doppietto 102mm ED 4" f/7; f.l.: 709mm) in una mecanica eccellente (tutti gli esemplari distribuiti dalla Aleph montano di serie il focheggiatore Feathertouch Micro Touch).
Doppietto ED 102mm con elemento a dispersione anomala che consente un a correzione elevata delle aberrazkioni cromatiche residue; trattamento antiriflesso m,ultistrato su ttutte le superfici; focheggiatore Feathertouch Micro Touch con riduzione micrometrica 1:10, anello di serraggio perimetrale (2" e 1.25") e rotabile indipendentemente dal tubo ottico.
Costruzione heavy duty, paraluce scorrevole, diaframmi interni knife edge antiglare.
Compresa coppia di anelli ricavati CNC dal pieno, barra coda di rondine tipo Vixen, innesto CNC per puntatore reflex AT (compreso con braccio distanziatore 60mm, come nella foto).
Ideale per chi cerca uno strumento a fuoco medio altamente corretto nel visuale e nell'imaging, compatto e di prezzo accessibile, ma con soluzioni ottiche e meccaniche d ultima generazione e definitive.
Prezzo altamente competitivo (chiedere per nostra migliore offerta) |
dettaglio del focheggiatore Feathertouch Micro Touch
dettaglio della finitura micalizzata
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This Astro-Tech AT102ED refractor has:
• 102mm f/6.95
fully multicoated doublet optics using ED glass Look at all the standard equipment features you get with this Astro-Tech refractor compared to competitive scopes costing up to $200 more. You get a rotating 2" Crayford focuser with a genuine Feather Touch dual speed Micro-Touch Focuser upgrade from Starlight Instruments. The Feather Touch MTF has a microfine 10:1 fine-focusing ratio. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. You get an illuminated metal body multiple reticle finder, not just a simple molded plastic finder with a single red dot reticle – or no finder at all. Want more features? You get an aluminum-frame lockable hard case as standard equipment. A case isn’t even available as an option with one competitive scope. You get dual split mounting rings with a separate detachable 8" Vixen-style dovetail plate that lets you mount and balance your AT102ED on virtually any altazimuth or German equatorial mount. It’s a better mounting solution than the less-flexible single clamshell ring with a single mounting foot that some competitive scopes are equipped with. You get a two-year warranty, double that of competitive scopes. The finely-machined Astro-Tech AT102ED comes with both 2" and 1.25" eyepiece holders that use non-marring brass compression rings that won’t scratch your star diagonal or eyepiece barrels. As with all Astro-Tech scopes, the AT102ED gives you fully-multicoated ED optics that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the bright-object images of lesser scopes, despite the fast focal ratio, and even at very high magnifications. Considering all the standard features you get that cost more or are unavailable with the competition, this feature-laden Astro-Tech AT102ED with a Feather Touch focuser upgrade is surely one of the best buys in astronomy! Features of this Telescope . . . ED doublet refractor optics: 102mm (4") aperture, 709mm focal length, f/6.95 focal ratio doublet optical system using an ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels.
Fully multicoated optics: The AT102ED objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It’s a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye.
Internal light baffles: Three contrast-enhancing knife-edge internal light baffles and a specially darkened tube interior provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast.
Dew shield: A self-storing retractable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as a neighbor’s backyard security light. The tube measures a highly portable 22.75" long with the lens shade retracted, and 27.75" long with it extended. A slip-on metal dust cap for the dew shield is standard.
Rotating 2" Crayford-style focuser: The precision-made no-backlash Crayford focuser includes a built-in camera angle adjuster as standard equipment. A hand-adjust locking ring on the body of the scope lets you quickly rotate the entire focuser a full 360° to line up a camera in either a landscape or portrait orientation (or any orientation in between) and lock it securely in place without losing your focus. You can also rotate the focuser to put a star diagonal and eyepiece into the most comfortable observing position, and temporarily lock the focuser in that position.
Feather-Touch dual-speed focuser upgrade: The focusing system has been upgraded with the addition of a famous Feather Touch Micro-Touch dual-speed focuser from Starlight Instruments that has been custom-made exclusively for the AT102ED. This is typically either totally unavailable or a $200 option with competitive scopes. The Feather Touch MTF has two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical 35mm or CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.
Long focuser travel: The long 85mm (3.35") travel of the focuser drawtube helps keep the overall scope length reasonable for convenient travel and storage. The long drawtube length also permits switching between visual or photographic use with no add-on extension tubes needed. The drawtube has a scale marked in 1mm increments so you can note individual focuser positions for easy return to the correct focus when switching between visual use and photography. A drawtube lock knob underneath the focuser lets you lock in your photographic focus.
Compression ring eyepiece holders: The focuser’s drawtube terminates
in a 2" eyepiece holder that uses a non-marring soft brass
compression ring to hold a 2" star diagonal and/or accessories in
place. The compression ring won’t scratch the barrel of your star
diagonal and accessories as an ordinary thumbscrew can.
Tube finish: The optical tube and lens shade are finished in a durable high gloss automotive-grade white paint, the same as that used on scopes several times the price of the AT102ED. The focuser, trim, and mounting rings are black anodized. The scope weighs 9.1 lbs with mounting rings attached.
Tube rings and
dovetail mounting plate: The 105mm o. d. body of the AT102ED comes
with a pair of hinged split mounting rings and a detachable 8" long
Vixen-style dovetail mounting plate. The dovetail plate fits
directly into the head of any Vixen-style equatorial and altazimuth
mounts. It will fit, without modification, the Astro-Tech Voyager
altazimuth mount, Celestron Advanced Series and Meade LXD-75 go-to
mounts; the Vixen Porta altazimuth mount; and Vixen Great Polaris
and Sphinx mounts, among others. The longer length of the dovetail
plate lets you balance the AT102ED more easily fore and aft in a
mount’s dovetail slot than the short mounting foot common on
competitive scopes’ clamshell mounting rings. This lets you quickly
accommodate changing balance conditions as you exchange an eyepiece
for a camera, a 1.25" diagonal for a 2" diagonal, etc.
Mounting holes for the supplied Astro-Tech #ATF non-magnifying illuminated multiple reticle finder are located at the 10 o’clock and 2 o’clock positions on the top of the focuser in front of the rotation lock ring. This lets you position the finder on the most convenient side of the scope to accommodate your eyesight. The multiple reticle finder has four different reticle patterns and seven discrete brightness levels. The rugged finder is precision-machined of anodized metal, not molded of plastic like the simple competitive finders with only a single red dot reticle.
Shipping/storage
case: The Astro-Tech AT102ED with Feather Touch focuser upgrade
comes in a locking 28.75" x 9.75" x 8.5" aluminum-frame hard
carrying case with carry handle. The case is not an option, as it is
with competitive scopes. The die-cut foam lining the case is cut out
specifically to hold the AT102ED.
Two year warranty: As an expression of the confidence Astronomy Technologies has in the quality of their products, the Astro-Tech AT102ED doublet refractor is protected by a two-year limited warranty against flaws in materials and workmanship, twice that of similarly-priced competitive scopes (shipping case excluded).
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AT 111 EDT tripletto |
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Tripletto ED 111mm (4.3") f/7 (777mm) in cella collimabile trattato antiriflesso multistrato di ultima generazione. Focheggiatore diametro libero 2.7" rotabile indipendentemente dal tubo ottico; riduttori 2" e 1.25" con anello di serraggio perimetrale. Manovra micrometrica con riduzione planetaria 1:11 ed escursione di oltre 135mm. Paraluce scorrevole. Diaframmi a bordo knife edge antiglare ricavati dal pieno. Tappo frontale in metallo e cap per riduttore 1.25"; staffa per puntatore reflex tipo Aleph Enhanced, AT o Burgess. Uno strumento nato per trasportare e proporre nel range dei sistemi 4" - 5" le qualità di eccellenza dell' EDT 90 della stessa Casa (definito il migliore strumento della sua classe di prezzo). Nato quindi per le applicazioni di imaging / ripresa fotografica più recenti e spinte, con il plus di un diametro superiore che consente prestazioni elevate anche in quanto a profondità immagine, magnitudine limite, prestazioni in visuale. Ottica di ultima generazione per materiali, soluzioni costruttive, esecuzione e montaggio. La meccanica curata ed heavy duty implementa soluzioni definitive: focheggiatore rotabile e micrometrico di grande diametro, paraluce scorrevole, accorgimenti antiglare suottica e interno tubo: ogni singola componente ottica e meccanica è allo stato dell'arte. Prezzo altamente competitivo (chiedere per nostra migliore offerta) |
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This Astro-Tech AT111EDT refractor has:
• 111mm f/7
fully multicoated triplet apochromatic optics using an ED
element and all Ohara glass With an aperture of 111mm (4.37"), this Astro-Tech AT111EDT ED triplet apochromatic refractor gathers over 18% more light than the more common size 102mm (4") refractors. Combine this extra light gathering with the Astro-Tech AT111EDT’s state-of-the-art optical multicoatings, and you have a scope that clearly outperforms similar (but more costly) competitive 102mm and 110mm refractors – and at a lower price! Astro-Tech uses only premium Ohara glass in the apochromatic triplet optics of the AT111EDT. This results in images that are essentially totally free of the annoying halo of unfocused violet light (chromatic aberration) that mars the bright-object images of lesser scopes, despite the fast focal ratio, and even at very high magnifications. These exceptional optics are even more impressive when you consider the package they come in. The finely-machined scope has a dual speed 2.7" rack-and-pinion focuser with a microfine 11:1 fine-focusing ratio. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. The supplied 2" and 1.25" eyepiece holders use non-marring brass compression rings that won’t scratch your eyepiece barrels. The Astro-Tech AT111EDT has a retractable lens shade and comes in a locking aluminum-frame hard carrying case. This feature-laden 111mm Astro-Tech ED triplet apochromatic refractor is priced hundreds of dollars less than competitive 102mm and 110mm scopes. At the price, and for the exceptional performance, it is an absolute steal! Features of this Telescope . . .
ED apochromatic triplet refractor optics: 111mm (4.37") aperture, 777mm focal length, f/7 focal ratio three-lens optical system using an ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. All three lens elements are precision ground and polished from the finest quality Ohara glass. Ohara is well-known as Japan’s premier manufacturer of specialized optical glass.
Collimatable lens cell: The push/pull lens cell is fully collimatable in the field for peak performance. A simple optional Cheshire eyepiece and your own eyes are all you need.
Fully multicoated optics: The triplet objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It’s a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye.
Internal light baffles: Contrast-enhancing knife-edge light baffles in the lens shade and the optical tube provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast.
Dew shield: A self-storing retractable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as a neighbor’s backyard security light. The tube measures a compact 23.75" long with the dew shield retracted.
Dual speed microfine 2.7" rack-and-pinion focuser: The precision-made rack and pinion focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 11:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical CCD imaging. The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather.
Built-in camera angle adjuster: The 2.7" focuser drawtube terminates in a built-in camera angle adjuster as standard equipment. It is not an optional extra-cost accessory, as it is with some other scopes. The camera angle adjuster lets you rotate the focuser a full 360° to line up a camera in either a landscape or portrait orientation (or any orientation in between), as well as put a star diagonal and eyepiece into the most comfortable observing position. A knob on the camera angle adjuster lets you lock the focuser at whatever angle is most convenient for you.
Extra-long focuser travel: The extra-long 138mm (5.4") travel 2.7" diameter focuser drawtube helps keep the overall scope length as short as practicable for convenient travel and storage. The tube measures only 23.75" long with the lens shade retracted, and 28" long with it extended. The extra-long drawtube length also permits switching between visual or photographic use with no add-on extension tubes needed. The drawtube has a scale marked in 1mm increments so you can note individual focuser positions for easy return to the correct focus when switching between visual use and photography. A lock knob on top of the focuser lets you lock in your photographic focus.
Compression ring eyepiece holders: The focuser’s 2.7" drawtube
terminates in a 2" eyepiece holder that uses a non-marring soft
brass compression ring to hold a 2" star diagonal and/or accessories
in place. The compression ring won’t scratch the barrel of your star
diagonal and accessories as an ordinary thumbscrew can.
Tube finish: The optical tube and lens shade are finished in a durable high gloss automotive-style white paint, the same as that used on scopes several times the price of the AT111EDT. The focuser and trim are anodized gun metal grey. There is an anodized dark green identifying band around the camera angle adjuster portion of the focuser body.
Tube rings: No tube rings are supplied for the 124mm o. d. optical tube, as some observers may already have rings for this size tube. If rings are needed, however, optional 124mm Astro-Tech #AT124R hinged tube rings are readily available.
Other supplied accessories: There is a dovetail foot on the upper left side of the optical tube for installing an optional multiple reticle red dot finder (#ATF). A slip-on metal dust cap is standard, as is a dust seal for the eyepiece holder.
Shipping/storage
case: The AT111EDT comes in a locking hard aluminum-frame case with
carry handle.
Two year warranty: As an expression of the confidence Astronomy Technologies has in the quality of their products, the Astro-Tech AT111EDT triplet apo is protected by a two-year limited warranty against flaws in materials and workmanship (shipping case excluded).
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AT 127 EDT tripletto |
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