Archived posting to the Leica Users Group, 2006/11/01
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Another way to look at it is this:
Same lens, same focus distance, smaller sensor means you have to enlarge
more to get the same sized print.
More enlargement means any focus errors will be magnified. Hence DOF must be
smaller.
"I don't make any calculations - am not really interested in the
mathematical aspects of photography - but a few months ago I did just a few
empiric tests with
the same 50mm/1.2 lens wide open on a M6 and a R-D1 (with it's crop factor
of 1,5). It seems to be the opposite - on the R-D1 shots there was visibly
more
DOF. Same lens/smaller format = MORE DOF."
I think it's likely you shot the same subject from different distance,
due to the crop factor.
Lee Wai Leong
"And if you play golf, you're my friend..."
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