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bird watching
For Ha solar observing or imaging
This camera also exhibits zero amp glow
Frame your shot anyway you like and then focus with both coarse and fine dials
Askar 90mm f/5.6 Quintuplet Petzval Flat-Field Astrograph - FRA500 Admin - Sales Statement - In Title bird watchingDescription Sharpstar Optics introduces Askar FRA500 astrograph, which is the youngest among the well known FRA family, to our customers. Compared with its siblings, the 500mm focal length refractor has an aperture size of 90mm (f 5. 6), so Askar FRA500 can better fit into the scenarios of deep sky imaging than Askar FRA400. Besides, its more lightweight and compact than Askar FRA600, which makes it a great choice for out door observation or
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