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Nice shot Bert.
I have taken some lens shots with an STL11 which is a similar sized chip to the 5D. I found I had to stop the lenses down a couple of stops to prevent coma which could get quite bad.
From digital astro yahoo group there were a few very knowledgeable people about lenses and they are often not that great fully opened up where the aberrations really start to show. There are some exceptions though.
The best lens shots I have seen were with Zeiss 300 F4 lenses. They seem to be really top end. Probably worth a lot of money too.
Greg.
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