The 2X factor is applicable if you are measuring diagonally, however, if
the important measurement is vertical, it is actually a bit less, more like
1.75 or something like that. Regardless, as a quick-and-dirty comparison,
the 2X factor for 4/3 vs 35mm is close enough for government work.
There is another factor involved here regarding DoF and apertures:
Diffraction. Lenses are diffraction limited per the enlargement multiplier.
So, that F4 in 4/3 = F8 in 35mm also extends diffraction limits. If a FF
35mm lens hits noticable diffraction limits at F16, the 4/3 lens will be
hitting the diffraction limits at F8. There really is no free lunch when it
comes to DoF, regardless of the "film format".
The only thing guaranteed to improve you images is the use of the classic
Silvernosed-Zuikos.
AG
http://www.zone-10.com
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