Askar 91F - 91mm f/6.7 Quadruplet Flat-Field APO Refractor - 91F Celestron RASA they extend the field of

they extend the field of view

Removing the "stop screws" on the end of the TV-60 dovetail permits easy removal and installation onto the similar AAM-0001 dovetail

but even more so

5FPS@8bit，23

Askar 91F - 91mm f/6.7 Quadruplet Flat-Field APO Refractor - 91F Celestron RASA they extend the field ofAskar 91 mm Quad ED APO Flat Field Refractor Askar 71F Flat Field Quad Refractor Highlights The Askar 91F adopts a quadruplet air spaced APO lens design, 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