The William Optics Flat6AIII is an apochromatic triplet 0.8x flattener/reducer with STM-coated Ohara lenses. The 44.4mm image circle (43.1mm with the Z103) makes it a perfect match for full-frame sensors.
The Flat6AIII features adjustable spacing for use with a range of cameras and imaging systems. The Flat6AIII includes an M48 filter thread which will hold any standard 2" mounted filter.
Compatible with William Optics GT71, GT81, Z81 & Z103 telescopes which have an M63 x 1 thread. On the camera side there is an M48 x 0.75 male thread, which will accept any wide T-ring.
|Reduction factor||0.8 x|
|Telescope connection||M63 x 1|
|Camera connection||M48 x 0.75|
|Image circle||44.4 mm (43.1mm with the Z103)|
Telescope total backfocus distance
Distance adjustment needed for correct backfocus