Quote:
Originally Posted by h0ughy
so what would F2.2 do to the results?
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It (f/2.2) is about 2 photographic stops (EV) faster than f/4 so I'd expect all of the times in any f/2 tables to be one quarter of what they are in the Shiraz's published f/4 table. Just like the published f/4 table has approximately one quarter of the times that are in the published f/8 table, which also differs by 2 stops. It's really no different to equivalent photographic exposures
I'm not sure if the f/2.2 f number takes in to account the central obstruction, but if not that would need to be corrected for if one wanted to know any exact result which took account of the true light collection area. Not sure how much or whether that is already factored in to the f number.
Best
JA