ASKAR 80 mm f/7 ED Apo for astrophotography and observation - with optics test

ASKAR 80 mm f/7 ED refractor with improved color correction

The compact and ultra-light ED refractor is an easily transportable all-round telescope for observation and astrophotography. The well corrected optics offer good correction of chromatic aberration thanks to the moderate focal ratio and the ED glass used. The high-quality mechanics and the stable 2" R&P focuser guarantee successful observations and beautiful astrophotos.

Compact and lightweight - ideal for traveling
The dew cap can be screwed over the tube, which shortens the transport length to only 40 cm. Due to the weight of only 2 kg, the refractor can also be carried by small and compact mounts or photo tripods. The flexible dovetail bar (Vixen GP style) also offers a 1/4" internal thread, suitable for photo tripods. The carrying handle makes transportation and attachment to the mount even easier.

The high-quality 2" rack-and-pinion focuser
The modern and stable focuser is also designed for heavy accessories. It offers a focusing range of 70 mm and, of course, dual-speed for precise focusing in astrophotography. The focuser has an internal thread which enables problem-free adaptation of motorized focus systems, such as the EAF from ZWO, without the need for an additional adapter. Of course, the optional correctors for astrophotography are screwed to the focuser, so no tilting is possible. Of course, the focuser also offers 360° rotation for ideal camera orientation.

A special highlight of the focuser are two quick-release couplings for viewfinder telescopes and mini guide scopes. This provides space for a finder or red dot finder and a guide scope or a flexible camera mount for parallel photography.

Astrophotography with the 80 mm ED refractor
Photographing the moon and planets is no problem thanks to the well-corrected color error and the comfortable working distance. Three correctors specially calculated for the ED are available for deep-sky photography. The correctors are simply screwed to the focuser using the M58x1 thread. The following correctors are available:

1.0x flattener - The focal length of 560 mm and the focal ratio of f/7 remain unchanged.

0.85x corrector - The focal length is reduced to 476 mm and the focal ratio is improved to f/5.95.

0.7x corrector - The focal length is reduced to 392 mm and the focal ratio is improved to f/4.9.

Observation with the 80 mm ED refractor
The refractor is designed for all visual applications thanks to the generous working distance of 168 mm from the 2" receptacle and the convenient adjustment range of the focuser. You can use 2" star diagonal mirrors, all common Herschel prisms for solar observation (please note: only with additional attenuation filter) and even binoviewers.

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
Sharpstar has published a promotion video about this telescope on YouTube:

Technical Information

Teleskop-Service has collected a lot of helpful information on refractors and made it available in German as a PDF file: refraktoren.pdf

Safety informations: PDF Download