Quote:
Originally Posted by Rac
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Rac - I don't really understand the foucault pics you posted . The wavefront profile you posted on Cloudy Nights forum shows the original mirror ( at least according to the `Figure XP' extrapolation, to be smoothly overcorrected by 1/6 wave or so on the surface .
The before and after foucault pics should therefore look pretty much the same with slightly deeper shadows on the 'before' . However your posted 'before' picture shows a pretty much spherical mirror beyond the 70 or 80% zone -not the strong roll off in shape from sphere you would expect to see in both the before and 'after' picture .