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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