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Old 03-06-2010, 08:14 PM
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gregbradley is offline
Join Date: Feb 2006
Location: Sydney
Posts: 16,817
Originally Posted by bert View Post
I shot some images on a qsi583 with the 1.25 filters last week with a tak fsq106 at prime. It DOES vignette. I suppose it could be flated out, but I was playing around and didnt get too serious about calibrations.

It may not on slower scopes with a shallower light cone, I didnt test it though.

Depends what you mean by vignette. Some setups appear to vignette but flat field nicely. I have a few setups that "vignette" badly but flat field out nicely. AP140 with the compressor/corrector, FSQ with its reducer, the BRC250 needed flats. All high end scopes and thats with 50mm square filters, large aperture openings all the way to the chip.

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