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Re: [OM] Calculating DoF question

Subject: Re: [OM] Calculating DoF question
From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
Date: Thu, 29 May 2003 14:19:20 +0800
You can check the DOF calculator here:

http://www.fineart-photography.com/dof.html

For the equivalent format focal length you can calculator the diagonal
size and do the math yourself.


C.H.Ling


Albert wrote:
> 
> Someone said, the larger the format, the shallower the DoF.  I'm not
> sure, but I'll take all your words for it..  That's probably why Large
> Format often shoots at F64, while I've yet to pass F16...
> 
> OK, here's my question.  I'm sure someone will give me the magical
> formula on how to calculate DoF equivalence..
> 
> If I have an f3.5 for a 6x7 format, what's that equal to in 35mm for the
> same mm lens?  What about a 6x9 format?
> 
> How do I calculate that?  Let's say a 50mm lens in 35mm..  That's about
> equal to an 80mm lens in 6x6, and about 100mm in 6x7.
> 
> Suppose I have a 80 f2.8 in 6x6 format, or a 100mm f3.5 in 6x7.  What's
> that equal to in 35mm?
> 
> Thanks.
> Albert

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