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Since their inception,Askar FRA series short focal ratio astrograph
have been very well received by astronomical amateurs.This year,
we launched the FRA300 Pro--the smallest 60mm F/5 Petzval
astrograph with the fastest native focal ratio in the FRA series so
far,its focal length is 300mm.
The star is sharp and delicate.At the center of its field of view, the
RMS radius can reach 2um. Even a serious user can also be
satisfied when it comes to the shape of stars.It performs excellence
with full-frame and supports 44mm imaging,which is a rare
astrograph for amateur astronomers.Compared with F/6 or F/7，
F/5 can effectively reduce the exposure time,helping you get the
same 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-spaced
structure, including one piece of ED glass, it also adopts a
fully-multi-coating to effectively remove stray light.
In particular, the rear group lens adopts the two pieces of refractive lenses, which improves both the star quality and the aberration correction performance, and it has a very good control of full-frame peripheral light reduction.
Aperture: 60mm
Focal length: 300mm
Focal ratio: F5
Image circle: 44mm full-frame
Total length: 303mm
Net weight: 2.26kg
Gross weight: 3.12kg
Rear - end thread：
M42×0.75 male thread
M48×0.75 male thread （ built - in 2 " filter thread adapter）
M54×0.75 male thread
