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Thanks for that info Ken, I'll add the spreadsheet to my little text file I've been compiling, showing all the trivia relating to various focal reducers, it's quite handy. I'll link the most recent copy here for your review.
I've tried the Antares 6.3 a couple of nights ago with my 1000d and it gave very good results at my suspected distance, 85mm, very little star distortion too. Interesting that as I wanted to keep my Meade 209 (remote) electric focuser attached, I put the FR and spacer array with the camera, at the back of the focuser. Little or no vignetting on the C8.
I'm presently looking for a used Celestron 6.3, as its longer FL would allow me to put it in front of the focuser directly on the OTA, which is my preferred position. With the QHY8 Pro I'd have more latitude due to shorter internal sensor distance.
I want to verify similarly for the other FR's I've collected, but been too busy.
Will be interesting to see how they jibe with your spreadsheet calcs. It was strange that some of the FL's I saw were so different to the published ones. Only a real star test will tell.
I like the range of FL's and speeds that a C8 or such will give with FR's or a Hyperstar for the really wide stuff. Suits my type of imaging activities, which are basically happy snaps.
Cheers,
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