Askar FRA300 Pro 60mm f/5 Quintuplet Petzval Flat-Field Astrograph Telescope

Since their inception,Askar FRA series short focal ratio astrographhave been very well received by astronomical amateurs.This year,we launched the FRA300 Pro--the smallest 60mm F/5 Petzvalastrograph with the fastest native focal ratio in the FRA series sofar,its focal length is 300mm. The star is sharp and delicate.At the center of its field of view, theRMS radius can reach 2um. Even a serious user can also besatisfied when it comes to the shape of stars.It performs excellencewith full-frame and supports 44mm imaging,which is a rareastrograph for amateur astronomers.Compared with F/6 or F/7，F/5 can effectively reduce the exposure time,helping you get thesame exposure in less time.In addition, the entire OTA is compact,making it the portable choice for field photographers. FRA300 Pro 's objective lens adopts a quintuplet fully air-spacedstructure, including one piece of ED glass, it also adopts afully-multi-coating to effectively remove stray light. In particular, the rear group lens ad