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Originally Posted by h0ughy
nice one Roger, but how did you get the F5.75 in the 12"?
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That's just what it happens to be with the combination of F/3.3 reducer and the spacers I'm using. It's actually the only way I can reach focus with the F/3.3 because of the JMI NGF-C between rear cell and reducer. I think that's the cause of the distortions too - if I had more room to play with varying spacers I'd probably be able to fix it.
Roger.