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David, I don't think I would waste a filter. If you want to see if your theory is sound, just cut a small piece of a screen window just the size of a filter and place that in your filter wheel. I will be very surprised if you see any diffraction spikes.

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Hi Jerry,
I don't have an extra filter to waste. The screen idea might work. Actually what I was thinking about was using a little flexible adhesive and attach two fine wires to the rim of a clear filter. The adhesive will peel off and bring the wires with it. I'd be careful not to touch the surface of the filter with the adhesive.

If it works, I can look into a photoetch type paint. The problem is going to be to try to find an inexpensive filter that's parfocal with the filters I already have. If the filter isn't parfocal I don't think it will be useful.

David

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