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

the William Optics Ultra-Cat 108 supports medium-format and full frame cameras for stunning wide field images

Android 12 or higher Dimensions Optical Tube 24" x 7" diameter Mount 18x12x10" Tripod (Collapsed) 13x12x32" Assembled System 24Lx26Wx48H" Weight Optical Tube 10

craftsmanship

EdgeHD (8"

Focus gain: depending on configuration about 1

The diagonal bodies of each are machined from solid blocks of aluminum

SKU (#) 2956214 EAN CODE 4047825022783 NET WEIGHT (G) 100 OPTICAL LENGTH (MM) 9

lets you focus a SC optics directly on the eyepiece - without mirror shift

ZWO 2" nosepiece with M54 male threads

Allows use of 2" astronomy filters at the bottom of the nosepiece

you can view incredible detailed views of celestial objects and identify what you are looking at

and even solar flares and coronal mass ejections