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Iwas joeking wrote:
I doubt it, f11 and the bird is small in the frame, should be lots of dof. Still looks good though.
1) The focal length is very long.
2) The effective focal length is much longer after cropping. That affects DoF because of the enlargement factor.
3) The bird is a very small bird, so the photographer was close to it. Maybe 5 metres.
4) Do the math. To help you, here is a link. http://www.cambridgeincolour.com/tutorials/dof-calculator.htm
Using full-frame, but using a conservative effective focal length of 1000 mm due to the extreme cropping (preserving less than half the linear dimension), f/11, the DoF is from 4.99 m to 5.01 m, and the calculator declares it as 0.01 m or 1 cm or about 3/8 inch.
That agrees with the visual inspection of the cropped image.
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