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So I picked up a classic... a 1970's - 80's edmund optics f6 150mm newtonian... ... like this one but mine has a different mount. It was cheap. Very good condition. The focuser is pants. The mechanics of the secondary holder is (IMHO) brilliant and apparently the primary is 1/10th wave. But its f6 and I trhink I'd rather swap it out for a faster synta f5 mirror. . The thing is its a one shot job bc to make the f5 mirror work I will have to saw off a good few cm from the barrel of the scope. So the question is: Is a high quality f6 mirror better than a faster synta f5 mirror for wide deep space astrophotograhy? All comments gratefully received.