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Karl,
It can be done with some lenses. I tried with a Zuiko 50mm lens and an adaptor I made up from a x2 convertor body to accept a 1.25" nosepiece (similar but shorter than the Mogg type)
The problem was, that to clear the rear lens element the nosepice had to be shortened to about 15mm. This means that the SA100 would end up only 25 to 30mm infront of the CCD chip which doesn't give a very good plate scale.
As an objective grating you're obviously limited to the 25mm clear aperture of the filter.
Ken
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