Long Telephoto lenses and increasing depth of field?
drj3
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Posts: 12,632
Re: You get same DOF....
1
C Sean wrote:
You can only get so far all the magnifications same, but never get the same perspective or background blur, but the DOF will be same.
I imagine you can zoom out a bit to increase the DOF and crop in later if you have spare megapixels but in general use of long telephoto lenses is because you can get close to the subject by foot.
It will not help to zoom out and then crop. The DOF will decrease as you crop (equivalent to increasing the image size without changing viewing distance or decreasing the viewing distance for an image of a given size).
See the attached example of the full image with a DOF of the center nail head of 2.1 inches and then the crop where the DOF is close to the width of the nail head (about .25 inches). The images were done for focus accuracy tests on my lens.


Olympus E-510
Olympus E-5
Olympus E-M1
Olympus OM-D E-M10
Olympus E-M1 II
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