Askar 90mm f/5.6 Quintuplet Petzval Flat-Field Astrograph - FRA500 5" Telescopes Standard features include a 2-stage

Askar 90mm f/5.6 Quintuplet Petzval Flat-Field Astrograph - FRA500 5" Telescopes Standard features include a 2-stageDescription 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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