You can figure that as 2/3's of a stop. F/2.0 set on the lens would actually be about f/2.5 with the converter. That is figuring 2.0 - 2.2 - 2.5 - 2.8 - etc.
graywolf http://www.graywolfphoto.com "Idiot Proof" <==> "Expert Proof" ----------------------------------- Don Sanderson wrote:
How does one figure partial stop numbers? For instance what stop is half way between 4 and 5.6? And where does 4.76 fall? This is a 2.8 lens with the SMCP-F 1.7x converter. I'm guessing there is a simple multiplier for this but with my limited knowledge of math I have no clue what it is. This is more out of curiosity than necessity. Someone posted a link to this info but I can't find it again. TIA Don
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