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You could try the f3.3 reducer...
Works well with small sensor camera's (I've used it with 224MC), back spacing is considerably less... not sure if you can get these new anymore though...
Won't come to focus with a DSLR (not enough inwards travel) but, fine with dedicated Astrocams where the sensor depth is only 12mm or so...
I have a spreadsheet Ken (Merlin66) sent me that shows you what's what with regard to spacings... but, apparently can't upload it here..
Send me a PM with your email address if you would like a copy, might help you out with deciding if the f3.3 is of any use to you..
Cheers
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