Quote:
Originally Posted by codemonkey
Nice work Ray!
Re the 1.25" filters - what's your spacing like? I didn't realise they could affect the shape like that, I thought it was just a matter of vignetting. Is that affected by f-ratio, as vignetting is?
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I had to put a shim in to keep the filter holders from rubbing against the input window of the camera - so as close as is possible. I think the effect is worse on fast scopes, but I only have f4 scopes. However, my interpretation is that the pacman shape comes about because the vignetting modifies the light cone to the extent that it no longer focuses to a fine point - it probably will not be as bad with a slower scope.