71F Flat-Field Starizona field-flatteners

field-flatteners

Up to 30 kg with a counterweight

with plenty of flexibility for post-processing and fine-tuning

still ideally sized for use with our Air-Chair observing stool

25” focusers

71F Flat-Field Starizona field-flattenersThe Askar 71F is an OTA with an aperture of 71mm, a focal length of 490mm, and a native focal ratio of F6. 9. The Askar 71F adopts a quadruplet air spaced APO lens design, including one piece of ED glass which can effectively reduce chromatic aberration. The Askar 71F supports 44mm full frame imaging with great performance of the surrounding star points. The Askar 71F is a self flattened design that allows users to avoid calculating the back focus and