Askar 111 / 766 mm f/6.9 Quadruplet Flatfield Apo - with Optics Test

Askar 111F 111 mm f/6.9 Quadruplet Flat-Field Apochromat

The Askar 111F combines the strengths of a high-performance astrograph with the advantages of a high-quality APO refractor for visual observation. The meticulously designed 3-element ED lens ensures excellent chromatic correction and delivers high-contrast, brilliant images with exceptional sharpness.

Thanks to the built-in field corrector, astrophotographers benefit from a flat, optimally illuminated field of view - ideal for modern camera sensors. At the same time, the high-quality optics deliver an impressively clear and natural image all the way to the edge of the field of view, also during visual observation.

Whether for detailed deep-sky images or casual observations of the Moon, planets, and star fields, the Askar 111F stands out as a versatile, premium apochromatic telescope for demanding astronomers.

Astrophotography - easy and with perfect results

The Askar 111F makes astrophotography exceptionally convenient and straightforward. Simply connect your camera, focus, and get started right away - thanks to the built-in corrector, the camera is automatically positioned at the correct working distance. There´s no need for complicated calculations or additional extension rings.

The high-quality focuser with a precise 1:10 reduction ratio enables smooth and accurate focusing - a crucial advantage for high-resolution astrophotography. For maximum compatibility, a comprehensive adapter set with M54x0.75 and M48x0.75 threads is available, allowing numerous astro and DSLR cameras to be easily connected.

For all astrophotographers looking for even higher speed and a larger field of view, an optional 0.74x reducer is available for the Askar 111F. This reducer was specifically designed for the apo and is optimally matched to its optics..

Thanks to its built-in 360° rotation, you can perfectly align your camera with the desired celestial object without having to reposition your entire setup. This makes the Askar 111F a well-designed tool for serious astrophotographers.

The apo is also a powerful telescope for observing

The Askar 111F not only excels in astrophotography but is also an outstanding apochromatic telescope for visual observation. Thanks to its compatibility with 1.25" and 2" accessories, the telescope can be flexibly combined with a wide variety of eyepieces and accessories.

The excellently corrected optics enable impressively high-contrast and sharp views of the Moon and planets - the apo handles even high magnifications of up to about 300x with astonishing detail. Crater structures on the Moon, fine cloud bands on Jupiter, and the Cassini Division in Saturn´s rings are rendered clearly and precisely.

However, the Askar 111F truly shines when observing extensive deep-sky objects. Large nebulae, open star clusters, and galaxy fields benefit from the flat field of view and excellent edge sharpness. Even when using long-focal-length 2" wide-field eyepieces, the stars remain pinpoint and razor-sharp all the way to the edge. This allows you to enjoy fascinating panoramic views of vast star fields and impressive galaxy clusters.

This is how Teleskop-Service guarantees the consistently high quality of the refractor:

The mechanics are tested, the focuser is optimally adjusted.

The lens is cosmetically checked and cleaned. We also check that all counter screws are correctly tightened. These often loosen during transportation.

The optics are collimated and the result is checked on the optical bench. The telescope is given a serial number.

A complete optics test is carried out, which is enclosed with the telescope (star images and ronchi image on the optical bench in autocollimation).

Only then are the telescopes handed over to the warehouse and prepared for dispatch.

Video of the adapter change
The manufacturer has created a short video about changing the adapter: Link to the video

Technical Information
Teleskop-Service has collected a lot of helpful information about refractors and provided it in English as a PDF file: refractors.pdf

Safety informations: PDF Download