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Hi, I bought a Celestron focal reducer / corrector lens part #94175 for my non Edge CPC1100. Celestron say - in bold type no less - that this reducer is not compatible with Edge HD optics. The cost of the dedicated reducer for the Edge optics ( #94242 ) is ~ $200 more than the non Edge version Out of curiousity, and to make sure what Celestron say was correct, I tried the non Edge focal reducer part number #94175 on my 8" Edge telescope - and it works just fine. The field of view is expanded as it should be and the clarity to the edge of the view is as clear as when not using the reducer. IE vignetting is minimal / non existent Has anyone else found this to be true with their Edge and non Edge telescopes? This is significant; the price difference is about $200 between the two reducers and, in my case, the non Edge reducer gives me altitude clearance on the bottom of my Evolution mount whereas using a dedicated Edge reducer ( #94242) would not. So if you're in a similar to me, try the non Edge reducer first before spending an extra $200. Siouxsie