Askar FRA600 108mm f/5.6 Quintuplet Petzval APO Refractor (Pre-Owned, Excellent)

Today Sharpstar announces the newest addition to its Askar FRA series, the Askar FRA600/5.6. Following the excellent optical performance of its first FRA400/5.6,the FRA600/5.6 is an evolution of the FRA series, an upgraded lens has a 108mm aperture and a 600mm focal length,the f/ratio is still f/5.6, and the image circle is 66mm surpass the full frame!