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Astro-Tech illuminated multiple reticle finder  Astronomy Technologies 
Astro-Tech illuminated
multiple reticule finder

The Astro-Tech #ATF multiple reticule finder is a single-power illuminated multiple reticule red-dot finder for astronomy and daylight terrestrial use. The lightweight and compact Astro-Tech finder features a precision ground reflex lens viewing window with minimal parallax; four different reticule patterns; seven brightness levels; and a two-part mounting base for installing the finder on a variety of telescope.



1.25' 99% reflectivity dielectric mirror diagonal with compression ring eyepiece holder Astro-Tech 1.25" 99% reflectivity
dielectric mirror diagonal with compression ring

This 1.25" Astro-Tech first-surface mirror star diagonal is a Sky & Telescope Hot Product for 2007! Sky & Tel recognized that it would be an outstanding value at twice its low price. As it is, this diagonal is unique among 1.25" star diagonals for its exceptional price/performance ratio. This is one premium-quality diagonal not priced like one.
 

 

Astro-Tech 2" 99% reflectivity dielectric mirror diagonal for refractors, with compression ring eyepiece holder and 1.25" adapter
This 2" Astro-Tech first-surface mirror star diagonal has state-of-the-art 46-layer dielectric mirror coatings for a full 99% reflectivity. The durable ion-deposited dielectric coatings on the mirror’s finely-polished 10mm thick 1/10th wave BK7 optical glass substrate also provide higher contrast and resolution during critical planetary, lunar, and binary star observations.

 

2' 99% reflectivity dielectric mirror diagonal for refractors, with compression ring eyepiece holder and 1.25' adapter

 Astro-Technologies 2-inch 99% reflectivity guaranteed 1/10th wave quartz mirror diagonal for refractors.
With compression ring eyepiece holder & 1.25" adapter

This 2" Astro-Tech quartz star diagonal has state-of-the-art 46-layer dielectric mirror coatings with a full 99% reflectivity for the brightest possible images. This is substantially higher than the 88% reflectivity of a conventional aluminum diagonal or the 96-97% reflectivity of an easily tarnished silver diagonal.



 

Astro-Tech 2" 99% reflectivity dielectric mirror diagonal for SCT's, with compression ring eyepiece holder and 1.25" adapter
You don’t have to buy a special version of the diagonal or special adapters to be sure that it can swing through your 8" scope’s fork arms, as you do with some competitive diagonals. This Astro-Tech diagonal is, quite simply, unique among premium-quality 2" SCT star diagonals for its exceptional value.

 

 

Astronomy Technologies 2" 99% reflectivity guaranteed 1/10th wave dielectric quartz mirror diagonal for SCTs, with compression ring eyepiece holder and 1.25" adapter
This 2" Astro-Tech quartz star diagonal has state-of-the-art 46-layer dielectric mirror coatings with a full 99% reflectivity for the brightest possible images. This is substantially higher than the 88% reflectivity of a conventional aluminum diagonal or the 96-97% reflectivity of an easily tarnished silver diagonal.

 

Astro-Tech 35mm extension tube
for Ritchey-Chrétien  imaging

This Astro-Tech 35mm long x 2" diameter extension tube can make up for the loss of light path when a 2" star diagonal is removed from many refractor telescope focusers and replaced by a camera and camera adapter for imaging. In some cases, it is also useful to replace the light path lost when a full-sized 2" diagonal is replaced in the scope by a shorter light path 1.25" diagonal.


 

Astro-Tech 50mm extension tube
for Ritchey-Chrétien  imaging

This Astro-Tech extension tube is also used with Astro-Tech Ritchey-Chrétien reflectors. With these Astro-Tech scopes, the scope’s focuser is used by itself or (more typically) in combination with one or both 2" thread-in extension tubes supplied with the scope to place the camera or eyepiece at the fixed telescope focal plane. A single extension tube will often do the trick for visual observing with a star diagonal. Both extension tubes will generally be needed for imaging with webcams and DSLRs.

 

Astro-Tech 80mm extension tube for Ritchey-Chrétien  imaging
This Astro-Tech extension tube is also used with Astro-Tech Ritchey-Chrétien reflectors. With these Astro-Tech scopes, the scope’s focuser is used by itself or (more typically) in combination with one or both 2" thread-in extension tubes supplied with the scope to place the camera or eyepiece at the fixed telescope focal plane. A single extension tube will often do the trick for visual observing with a star diagonal. Both extension tubes will generally be needed for imaging with webcams and DSLRs.