Several recent cameras introduced at Photokina have something close to a 40mm-equivalent lens. The Panasonic G1 has a 20mm (40mm-e) ƒ/1.7 announced for a 2009 delivery and shown in mock-up at the show, and the Olympus Micro 4/3 camera has what looks like something similar. Today we've learned that the new Sigma DP2 will have a 24.2mm lens, which on the Sigma's Foveon sensor is 41mm-e. You've probably noticed that I seem to approve.
So what's the big deal about that focal length? Isn't it "boring"? In case you're wondering, here's an article called "Why 40mm?"
Mike (Thanks to Amin)
Featured Comment from Dennis Allshouse: "I was interested in your comments about bokeh, particularly how bokeh degrades at the widest aperture. Same if the background is far removed. Both these observation seem counter-intuitive. Have you written about bokeh elsewhere? And if not maybe a separate article is called for. I'm certainly interested in your thoughts. Thanks!!"
Mike replies: I've written about it many times, many places, including a column in two parts in Black & White Photography magazine. Here's a .PDF download called "Lens Bokeh Ratings" from my photo book site. It mainly rates specific lenses, but there's a fairly comprehensive introduction. You're welcome to print this .PDF for your own use or share it in electronic form with friends. More than 44,000 people have downloaded this file since 2005.