#24: Thanks, but the lens straight on reminds me too much of the Apple Aperture logo.
#23: Beautiful. I like the feel of depth, and I really love the simplicity. This feels much more professional than a lot of my other options, and I think that is because of the simplicity. I keep staring at the blurry white glare on the right side of the mark, and I'm not sure that that part is working for me though. It seems distracting somehow.
#25: Thanks! It's good to see how this would work in B+W. :)
I think the shape on #40 is a bit too abstract for me. It makes me think of a curl of air or smoke. While that is kind of cool, I think #23 has more of an association to photography, light, and magic.