Depth of Field: DX v. FX

Started Oct 17, 2010 | Discussions thread
wetsleet
Regular MemberPosts: 121
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Re: Depth of Field: DX v. FX
In reply to binary_eye, Oct 19, 2010

binary_eye wrote:

wetsleet wrote:

Consider a D3. Flip between dx and fx mode. Did the DoF change. No, of course it didn't!

Sure, but the resulting shots aren't framed the same. The relevant question is whether FX has less depth of field than DX when the subject is framed the same.

Sensor size has no effect on Dof.

Yes, it does. Depth of field is the result of aperture and magnification. Magnification is based on distance to subject, focal length, and format size.

Good grief, it's not as if my original post was too long to read in its entirety. If you get as far as reading the whole post you will see that I make exactly that point, that it is when you seek the same angle of view in DX as in FX (and hence are obliged to change down to a shorter focal length) that the DoF changes. The change in DoF is due entirely to the choice of lens, not the sensor size, although the sensor size drives the choice of lens, hence the shorthand assumption that sensor size itself affects DoF.

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