theSuede
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 p.2 #2 · Sigma 150, not opening to 2.8 | |
Regarding the DoF vs aperture question.
No matter WHAT the bellows factor or the focusing method is, the DoF in your picture is a PURE FUNCTION OF EFFECTIVE APERTURE, IE LIGHT EFFICIENCY. So you get different DoF - with the same nominal F/no! - depending on your effective aperture.
So I really don't see why reporting the TRUE aperture, and thereby indicating TRUE light efficiency/s (exposure) and TRUE depth of field can be wrong. Nominal F/no says NOTHING about your DoF or how much light is really needed to expose correctly when you aproach makro distances. It can be off by as much as a factor of four (2Ev)!
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