BAADER M68 EXTENSION TUBE Optical Thickness:100mm Optical design Ritchey-Chrétien Diameter 406

Optical design Ritchey-Chrétien Diameter 406 mm Focal length 3250 mm Focal ratio f/8 Linear obstruction 170 mm Corrected field 35 mm (70 mm with optional corrector) Backfocus distance 288 mm from rear cell Focuser thread M77 x 1 female

It has an optical thickness of 17

All the USB 3

Transmission range

Full-frame

BAADER M68 EXTENSION TUBE Optical Thickness:100mm Optical design Ritchey-Chrétien Diameter 406The Baader M68 extension tubes have male M68 x 1 threads on one side and female M68 x 1 threads on the other. They can be useful for reaching the precise backfocus distance as required by correctors. It features a knurled ring for easy gripping. Specifications Optical length 7. 5 to 100 mm Clear aperture 62 mm Outer diameter 76 mm Connection telescope side M68 x 1 male Connection camera side M68 x 1 female Weight 30 to 170 g