FRA series

Askar 0.7x Full-Frame 2.5" Reducer f/3.9 for Askar FRA400 72mm & FRA500 90mm Telescopes

Askar provides a brand-new F3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, easy for the attachment of 2" filters.

Note: This item may or may not have the 'Askar' brand imprinted on the item as pictured above. It just varies from batch to batch.

กล้องดูดาว Askar FRA400 72mm f/5.6 Quintuplet Petzval Flat-Field Astrograph #FRA400

• ASKAR FRA400 Quintuplet refractor with 72mm aperture and f/5.6 focal ratio, ideal for wide-field imaging of the deep sky
• Petzval design ensures flat field across 44mm image circle, while two ED elements virtually eliminate chromatic aberration
• Rotatable 3” rack-and-pinion focuser, M68-M48 adapter, 2” adapter ring, and 1.25”-2” adapter
• Includes mounting rings, Vixen-style dovetail, and carrying handle