Dr. Flat Master x0.8 Reducer/Flattener for GSO RC telescope

I was a bit nervous about getting the spacing right on my GSO RC, but the 0.8x reduction factor in this flattener made the whole setup surprisingly straightforward. The threads on the adapter are machined cleanly, so everything screwed together without any wobble. First light gave me a much wider, f

Finally round stars all the way to the edges on my RC, the 0.8x reduction really tightens things up and cuts my exposure times. Backfocus spacing was fussy to dial in but once it was set the field flattened out nicely.

Star elongation at the corners of my RC is basically gone after adding this 0.8x reducer, and the field looks noticeably flatter across the whole frame. The threads matched up cleanly on my focuser, which I was a little nervous about. Shot M31 last night and the difference in coma was obvious.