Why recommend a superzoom for deep dof?

Started May 16, 2012 | Discussions thread
tko
tko
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not true
In reply to citizenlouie, May 16, 2012

1) DOF has nothing to do with FL if the subject framing is the same.

2.) If you use a longer FL at the same distance from subject the subject appear closer, with less DOF. That's because of the larger magnification. Twice the magnification gives 1/4th the DOF. So, standing in the same position, zoom in twice as much, 1/4th the DOF.

Every time you double the focal length, you half the DoF. For example, 100mm @ f/2 has the DoF half of that of 50mm @ f/2, or if you put the other way around, 100mm @ f/2.8 has the same DoF of 50mm @ f/2.

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