Askar FRA400 - 400 mm f/5.6 Quintuplet Petzval APO Astrograph - FRA400 polar alignment The barrel is also notched

The barrel is also notched to prevent the eyepiece from falling out of the focuser if the securing thumbscrews become loose

Baader Yellow 495nm Long-Pass Filter - Round Mounted Specifications

Compatible With the TSN-99/88/77/66 Spotting Scopes with TE-11WZ II Wide Angle Zoom Eyepiece

when batteries can lose charge quickly

56 Lens Coatings Fully Multi-Coated Prism Glass (Type) Bak-4 Prism Coatings Phase Coated Weight 24

Askar FRA400 - 400 mm f/5.6 Quintuplet Petzval APO Astrograph - FRA400 polar alignment The barrel is also notchedAskar FRA 400 mm f 5. 6 Quintuplet Petzval APO Astrograph Quintuplet Petzval Lens Astrograph 400 mm Focal Length 72 mm Aperture; f 5. 6 Full frame 44 mm Image Circle Generous 140 mm Back Focus With 2" and 1. 25" diagonal eyepiece for visual use 3" Big Focuser with microfine adjuster control 360 Rotator mechanism included M68x1 M48 Adapter Included Fits most cameras Multi Function Tube Rings Use with accessories This 72mm Astrograph from Askar, the