91F Flat-Field ADM Optical Head

Optical Head

We have taken this condition issue into consideration with the pricing

The tripod works perfectly

At the time of listing

the Filter cell has heavy duty threaded inserts and nylon thumbscrews

91F Flat-Field ADM Optical HeadThe Askar 91F is an OTA with an aperture of 91mm, a focal length of 609mm, and a native focal ratio of F6. 7. The optical design of the Askar 91F features a four element configuration (three elements in the front and one in the rear), including one piece of ED glass which can effectively reduce chromatic aberration. The Askar 91F supports 44mm full frame imaging with great performance of the surrounding star points. The Askar 91F is a self flattened