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[OM] Re: Converting fourthirds DOF to 35mm equivalent

Subject: [OM] Re: Converting fourthirds DOF to 35mm equivalent
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 02 Jul 2008 19:09:46 -0400
But, assuming that you are not at a diffraction limited aperture the 
shorter focal length lens on the 4/3 camera still delivers greater DOF 
at the same aperture.  That can either be a free lunch or a very costly 
one depending on your point of view for a particular photograph.

Chuck Norcutt

Ken Norton wrote:
> 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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