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Hi Bert
The reason i asked about the F4 performance is it may clear up the coma off axis so the full format and resolution of the 5D can be used , and I imagine will be a big help if you want to make mosaics , I wouldn't think you would need to stop down to F8 though.
Back in the days of film imaging just about every lens had to be stoped down to some degree to get the off axis performace up to scratch and film is quite forgiving compared with digital.
I just think its better to take a longish shot , say around and hour at F4 and get les noise and aberations . at the start of CCD imaging years ago people were amazed with what a short exposure could do , but now most people are imaging for several hours and getting much better results .
Just gets to how much effort , time and expense a good result is worth and what our definition of a good result is ,which changes as we get more and more into the hobby .
After saying all that , the main reason for building the 10" F3.5 was so guests could get a good image fast ( under one hour ) but still will get better ones shooting longer.
I think I'm finish my ramblings now.
Zane
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