The William Optics Flat61 is an apochromatic 1x field flattener for the Zenithstar 61. The 43mm image circle makes it a perfect match for full-frame sensors.
The Flat61 features adjustable spacing for use with a range of cameras and imaging systems. The Flat61 includes an M48 filter thread which will hold any standard 2" mounted filter. It also includes a handy camera rotator for precise framing of targets.
Compatible with William Optics Z61 which has an M54 x 0.75 thread. On the camera side there is an M48 x 0.75 male thread, which will accept any wide T-ring (sold separately).
|Reduction factor||1.0 x|
|Telescope connection||M54 x 0.75|
|Camera connection||M48 x 0.75|
|Backfocus distance||67.7 mm|