Askar 91F Flat-Field Quadruplet Astrograph | ASKAR-91F

Askar 91F Flat-Field Quadruplet Astrograph | ASKAR-91FThe Askar 91F is an OTA with an aperture of 91mm, a focal length of 609mm, and a native focal ratio of F 6. 7, designed for astronomy enthusiasts who prioritize portability, high optical quality, and ease of use, offering a flat field, full frame capable APO refractor ideal for wide field imaging and daytime spotting. The optical design of the Askar 91F features a four element configuration (three elements in the front and one in the rear), including

turn on the red dot

With a compact and lightweight body and 66mm objective lens

The QFocuser is exceptionally small

This 15mm M48 Extension Tube is designed to provide the perfect balance between ease of use and enhanced optical performance

and ASI224MC

embrace the grounding energy it possesses

57") Apparent Field of View: 43° Eye Relief: 31mm (1

Important note: The eye safety norm EN ISO 12312-2:2015 for naked eye solar viewers does not apply to front aperture filters

which fastens onto many tripod legs just as well

The entire reducer is CNC-machined and comes with front and rear metal threaded caps to protect against dust when not in use

It is automatic with this easy to use device

25” adapter V80 mode OTA Parameters Aperture size 80mm Focal length 500mm Focal ratio f/6