The William Optics Flat61R is an apochromatic 0.8x flattener/reducer for the Zenithstar 61. The 28mm image circle makes it a perfect match for APS-C sensors.
The Flat61R features adjustable spacing for use with a range of cameras and imaging systems. The Flat61R 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.
|Reduction factor||0.8 x|
|Telescope connection||M54 x 0.75|
|Camera connection||M48 x 0.75|
|Image circle||28 mm|
|Backfocus distance||56 mm|
|Distance adjustment needed for correct backfocus||1 mm|
Telescope total backfocus distance
Distance adjustment needed for correct backfocus