I just received my Skywatcher 100ED and was looking forward to suit it a little better for astrophotography. I found reviews and comparisons of most popular focal reducers but not many recommendations about their pairing with this particular scope. So far the candidates list looks like this (in no particular order) : Skywatcher .85x Reducer/Flattener : http://www.skywatcher.com/product.php?cat=28&id=179 Astrophysics CCDT67 0.67x Reducer : http://www.astro-physics.com/index.htm?products/accessories/photo_acc/photo_acc William Optics .8x Reducer /Flattener Mk IV http://www.williamoptics.com/accessories/flattener4_features.php William Optics .8x Reducer/Flattener Mk II http://www.williamoptics.com/accessories/reducer_features.php Meade/Celestron 6.3 FR The SW .85x an WO 0.8x Mk IV I'm sure are suited for this scope and should perform in line with their prices. The Mk II version of the WO 0.8x I'm uncertain about, I was looking at its specs and they described it as "optmized for 66mm refractors while also suited for 80 and 90" however in the bottom the Megrez 110 APO is also listed, which gives me some hope. The CCDT67 is commonly used on RCs type scopes but seems compatible with refractors too as long as the focal ratio is f/9 to f/18. I've read about people who have fit it to their SW80ED but there weren't comments on the performance. The Meade/Celestron I have read mixed reviews and seem to require a bit of tinkering to fit. Any thoughts will be appreciated P.S. I have also been wondering what parameters to look for to see if they're compatible with my setup. I only have my DSLR with a T-nose adapter and UHC filter as image train, that means I just have to buy extensions to bring the camera chip at the distance indicated in the reducer specs, and eventually another adapter to fit the reducer to the 2" focuser (as in the Meade/Celestron reducers), right ?