I expected this to cure the edge distortion I was seeing (even quite far in from the edges it was noticeable) but it still surprised me when I pulled the frames off the camera. An essential purchase on a larger sensor and I suspect a help on medium sized sensors too. There appeared to be an unusual amount of dusty white debris around & on the reducer in its Skywatcher box which was a little disconcerting, but some very gentle air blow and cleaning has got it looking clean and clear.

The flattener perfectly fits on my SkyWatcher ED80 doublet! The images are flat-flat! No stars comma, chromatic aberration or anything related to that.

At the moment I'm using it for imaging with a stock Canon EOS T3i/600D and I get the focus without any problem. However, wasn't able to find the focus with a ZWO ASI 120MM mono planetary camera, so I'm looking for some extenders. Correct spacing is critical.

I recommend you ask a few questions before you buy this - FLO support team is the best, as always!