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Many thanks for those links Netwolf, images off that Centurion are great. I wouldn't like to wheel the beast in and out every night though.
Looks like prime imaging is mainly used by big mirrors and low F ratios.
I agree Tigerdes it wouldn't be worhwhile modifying a fully functual scope, but if starting from scratch with a big mirror, would be OK.
The trade off from buying a large secondary and 3 inch focuser would be in trial and error getting the concept to work properly.
If it does work ( smooth focus, easy collimation, no vignetting), you gain extra light (10%) than conventional.
Bill
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