Astro-Tech AT111EDT Refractor.

This Astro-Tech AT111EDT refractor has:
• 111mm f/7 fully multicoated triplet apochromatic optics using an ED element and all Ohara
glass
• collimatable lens cell
• dual-speed 2.7" rack-and-pinion focuser with 11:1 ratio fine focusing
• both 2" and 1.25" brass compression ring eyepiece holders
• retractable lens shade/dew shield
• long-lasting white paint finish with anodized grey trim
• aluminum-frame hard carrying case
• two-year warranty

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.
A supplied 1.25" accessory adapter slips into the 2" eyepiece holder to let you use a 1.25"
star diagonal, image erecting diagonal, or photographic accessories. Like the 2" eyepiece
holder, the 1.25" adapter also uses a non-marring soft brass compression ring to hold 1.25"
star diagonals and accessories in place. If you are partial to 1.25" eyepieces and need an
outstanding diagonal for this scope, consider the Astro-Tech 1.25" dielectric diagonal
(#AT1D). It's a Sky & Telescope Hot Product for 2007.
An Astro-Tech guaranteed 1/10th wave peak-to-valley accuracy 2" quartz star diagonal
(#AT2DQ) is recommended to deliver all of the scope’s exceptional optical performance to
your eye.

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. The scope comes in a locking hard
aluminum-frame carrying case with carry handle.

Supplied Accessories
Collimatable lens cell; retractable lens shade; dual-speed 2.7" rack and pinion focuser with 2”
and 1.25” brass compression ring eyepiece/accessory adapters; quick release foot for
finderscope; dust covers; hard case.

Price - £1239.00 + £10.00 shipping & insurance.

AT124R Tube Rings - £75.00

The Astronomy Shop

1 Tone Hill. Wellington

Somerset TA21 0AU

United Kingdom

Telephone: +44 (0)1823 665510