Hi, > 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).
some of my best friends are newspaper photographers <g>. --- Bob mailto:[EMAIL PROTECTED] Friday, June 21, 2002, 11:22:15 PM, you wrote: > ----- 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 . - 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 .
