07-20-2010, 09:15 AM
[quote name='wim' date='20 July 2010 - 10:36 AM' timestamp='1279614986' post='1148']
Hi Lars,
No, it actually does, and I did see the calculations for this a few times, somewhere. Unfortunately I don't hav eth elinks for thsi anymore, so I can't show those to you. It went a little beyond me anyway, the calculations that is <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. It may be a little less with FF than with APS-C, but it is roughly F/5.6 with the standard focusing screens. If this wasn't the case, it would make no sense to have focusing screens with a much, much finer matting structure for use with large aperture lenses.
In a way you can compare this with film/analog. The emulsion thickness of film, 0.2 mm, provides more DoF than digital does, with a sensor thickness of 0 mm. This is a similar effect, not entirely, but similar anyway.
Kind regards, Wim
[/quote]
I believe my own eyes over those calculations. If the viewfinder showed f/5.6 regardless of aperture, you wouldn't see any DOF effect of using the DOF preview button. I see a very clear effect. I'm guessing those calculations talked about using an f/2.8 lens.
-Lars
Hi Lars,
No, it actually does, and I did see the calculations for this a few times, somewhere. Unfortunately I don't hav eth elinks for thsi anymore, so I can't show those to you. It went a little beyond me anyway, the calculations that is <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. It may be a little less with FF than with APS-C, but it is roughly F/5.6 with the standard focusing screens. If this wasn't the case, it would make no sense to have focusing screens with a much, much finer matting structure for use with large aperture lenses.In a way you can compare this with film/analog. The emulsion thickness of film, 0.2 mm, provides more DoF than digital does, with a sensor thickness of 0 mm. This is a similar effect, not entirely, but similar anyway.
Kind regards, Wim
[/quote]
I believe my own eyes over those calculations. If the viewfinder showed f/5.6 regardless of aperture, you wouldn't see any DOF effect of using the DOF preview button. I see a very clear effect. I'm guessing those calculations talked about using an f/2.8 lens.
-Lars