WILLIAM OPTICS DR FLAT MASTER 0.8x REDUCER FOR GSO RC GM4000 The primary mirror sits on

The primary mirror sits on a 9 points cell and is collimatable with 3 pairs of push & pull screws

Bigger eyepieces will show vignetting

The objective lens has an aperture of 50mm and includes two ED (extra-low dispersion) lenses

The Chroma 3nm H-beta filter is also useful for imaging nebulae and objects rich in ionized hydrogen

5m Glass thickness 2

WILLIAM OPTICS DR FLAT MASTER 0.8x REDUCER FOR GSO RC GM4000 The primary mirror sits onThe William Optics Dr Flat Master is an apochromatic triplet 0. 8x flattener reducer for 12" 16" GSO Ritchey Chretien telescopes. The 52mm image circle makes it a perfect match for full frame sensors. On the camera side there is an M48 x 0. 75 male thread for connection to common imaging trains. The reducer has a large backfocus requirement of 86. 15mm from the last lens, shifting the focal plane in by 28. 6mm. Specifications Reduction factor 0. 8 x