DOF Resource

Can someone point me in the direction of a good discussion of DOF on

dslr's? I have an Evolt and in addition to a dedicated E-system lens

have some K mounts and an OM lens. The telephotos give me great

results but I am having some problems getting good focus from 28mm and

50mm standard lenses wide open at medium (less than infinity)

distances. It is not just the usual softness that comes from a fast

lens, and I can't attribute all of it to my diopter setting, etc. I'm

beginning to suspect DOF. Stopped down a bit (f2.8 or higher) they

are very sharp but at 2.8 or higher their value diminishes.

 

Thanks.

http://www.dofmaster.com/dofjs.html

 

http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/950/depth-of-field.html

Well, there's always <a href="http://www.photo.net/learn/optics/dofdigital/">

<b>http://www.photo.net/learn/optics/dofdigital/</b></a>.

 

<p>

I think it's the best article on DOF and Digital ever written, but then I know the author pretty well...

<p>

You might also want to take a look at <a href="http://www.bobatkins.com/photography/technical/diffraction.html"><b>Sharpness, Aperture and Diffraction</b></a> (by the same author!), though if you're taking about apertures wider than maybe f11, diffraction isn't much of a factor.

I'm glad to see Bob Atkins doesn't suffer from false modesty. But he is perfectly right. His article is the best place to start.