----- Original Message ----- From: <[EMAIL PROTECTED]> Subject: RE: Lens Sharpness?
> I remember reading in a book (I believe it was one of those Ansel Adams books..) that the best way to test for Lens sharpness/resolution was to take a photo of a newspaper stuck to a brick wall at a reasonable distance and then check the neg/print afterwards to determine how well the lens holds up. > > It was something along those lines.. anyone can correct me on this one :) Sure, that checks for how well the lens works for photographing newspapers at 15 feet. Unfortunately, it doesn't say much for how well the lens works for what you photograph (unless you photograph newspapers). Pint your camera at something with fine detail at or near infinity (bare tree branches or power poles would be good), and photograph it. That will tell you how the lens performs at or near infinity. Find a subject with very fine detail at a middling distance, perhaps 30 feet (unless of course, this is already infinity as far as the lens is concerned) and photograph it. This will tell you haw well your lens works at middling distances. Finally, repeat the test at a fairly close distance. Use your widest aperture, and then stop down about 3 stops, then another 3 stops for each distance. This will tell you what the lenses best aperture range is, at various distances. Note; I have never run such a test. I don't really care that much. William Robb - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
