Askar 91F

The 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 design that allows users to avoid calculating the back focus and buying additional flatteners. After attaching the imaging accessories, users can directly use it for shooting after the OTA is in focus. This further reduces the cost and improves the pleasure of shooting.

The Askar 91F strikes a balance between practicality and versatility while achieving lightweight portability through its compact design.The OTA weighs just 3.92kg, with a gross weight of 4.52kg (including the tube rings and dovetail plate).  

The Askar 91F is versatile in its use, allowing for both visual observation and astrophotography.     For user convenience, it comes standard with three visual accessories: an 8mm eyepiece, a 20mm eyepiece, and a 1.25-inch erecting prism.

Specifications