11-01-2010, 12:20 PM
[quote name='BG_Home' timestamp='1288597688' post='3859']
Same aperture, same composition, a FF shot has more shallow DoF than an APS-C shot. Yes, you can use a wider aperture on the APS-C, but when you're at f/1.4 on the FF, I guess you won't find an APS-C lens that'll give you the equivalent aperture.
[/quote]
Not true. Same aperture, same field of view, SAME DOF.
Aperture is measured in mm's. f-values are focal length divided by aperture.
Your proposition is a bit strange: One chooses an aperture to get the desired DOF. One does not choose an f-value just to take it as "standard across sensor sizes".
So Win is very right.... APS-C does NOT have a DOF "advantage". Equivalent f-values + equivalent field of views deliver equivalent images. And image softening diffraction also sets in at equivalent f-values. So in all aperture related areas, they are equivalent. Only FF has an advantage, as it can reach f-values with no equivalent available for APS-C (like you correctly identified).
Same aperture, same composition, a FF shot has more shallow DoF than an APS-C shot. Yes, you can use a wider aperture on the APS-C, but when you're at f/1.4 on the FF, I guess you won't find an APS-C lens that'll give you the equivalent aperture.
[/quote]
Not true. Same aperture, same field of view, SAME DOF.
Aperture is measured in mm's. f-values are focal length divided by aperture.
Your proposition is a bit strange: One chooses an aperture to get the desired DOF. One does not choose an f-value just to take it as "standard across sensor sizes".
So Win is very right.... APS-C does NOT have a DOF "advantage". Equivalent f-values + equivalent field of views deliver equivalent images. And image softening diffraction also sets in at equivalent f-values. So in all aperture related areas, they are equivalent. Only FF has an advantage, as it can reach f-values with no equivalent available for APS-C (like you correctly identified).