91F Flat-Field ADM Compact size in medium to

Compact size in medium to short focal lengths is achieved with the Nagler Type 6

Optical Head

It's an oldie but a goodie

The tripod works perfectly

Schott substrate material

91F Flat-Field ADM Compact size in medium toThe 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