I've seen the posts about the angle of view being the same for a 28mm lens on a 1.6 crop sensor as for a 50mm lens on a full frame. I understand it.

But what about the depth of field. Will that match too if the distance to the subject and aperture are the same?

marked as duplicate by MikeW, mattdm, Paul Cezanne, AJ Henderson, NickM Feb 5 '14 at 21:42

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  • The 28mm-->50mm conversion is fairly imprecise. 28mm on a 1.6x crop sensor translates to the same FoV as 44.8mm on FF. 31.25mm on a 1.6x crop sensor translates to 50mm on FF. The difference between 28mm and 31mm doesn't look that dramatic, but at f/2 and a 10' focus distance the difference in DoF (3' vs. 2.42') is about 7 inches! If the shooting distance is increased by just over 1 foot (to 11.07') with the 31mm lens to give the same FoV as the 28mm lens at 10', then the DoF is the same for both lenses. – Michael C Feb 4 '14 at 3:30

There are many apps and online DOF calculators, and the answer is: no, they're not the same. The full frame camera will have a considerably smaller depth of field with the same angle of view.

The formula for calculating the depth of field is quite complex, not at all a simple linear scale.

  • In the non-macro range, shooting with a 1.6x crop factor is like shooting with a 1.6x smaller aperture (larger number)... or pretty close to it anyway. – drfrogsplat Feb 4 '14 at 2:32

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