Astro-Tech AT111EDT 111mm

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Astro-Tech AT111EDT 111mm f/7 ED triplet apochromatic refractor

With an aperture of 111mm (4.37”), the 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 outperforms similar (but more costly) competitive 102mm and 110mm refractors.

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” linear Crayford 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!

Here are some comments about the AT111EDT from Joe Nastasi of Parallax Instruments, well-known for making some of the finest cost-no-object large aperture classical Cassegrain and Dall-Kirkham Cassegrain optical tubes and equatorial mounts available to the amateur astronomer. “The triplet optics are of the highest quality with as near perfect color correction as I have ever seen. The detail visible on Jupiter was stunning to say the least. The instrument delivered exceptional contrast and sharpness with belts and zones clearly defined. The extremely difficult swirls and polar mottling could occasionally be glimpsed. Quite extraordinary for a 4.37” telescope. In addition, the standard camera angle adjuster is a real joy, especially when using a binoviewer. All in all, I’m very pleased with this telescope.”

  • 111mm f/7 triplet apochromatic optics using an ED element and all Ohara glass
  • Fully broadband multicoated, with blackened lens edges
  • Dual-speed 2.7” linear Crayford focuser with 11:1 ratio fine focusing
  • Rotating camera angle adjuster
  • Non-marring 2” and 1.25” brass compression ring eyepiece holders
  • Self-storing retractable lens shade/dew shield
  • Long-lasting white paint finish, with hard anodized grey trim
  • Aluminum-frame foam-fitted hard case
  • Two-year warranty

Takes +-6 Weeks to get Stock

  • Model: AT111
  • Shipping Weight: 22lbs
  • 20 Units in Stock
  • Manufactured by: Astro-Tech

This product was added to our catalog on Thursday 29 November, 2012.

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