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Robert if you look at the graph, the 2.5 is only 2.5 at 0mm from the top glass. There is 40mm between the glass and the top of the compression ring. Then add 15mm for the CCD distance.
Yeah, I agree a 3.5 or 3x powermate would be perfect. It would give nice image scale. I suspect a lot of guys in the States are dooing resampling to achieve the image scale they get. Must write a little email to Al.
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