Yesterday I posted this piece on testing for lens decentering using manual focusing. Today I’ll explore an autofocus variant that might be useful when there’s not enough depth of field for the first technique to work well. I mounted a Sony 90mm f/2.8 macro lens on an a7RII and set it up about 20 feet… [Read More]
Archives for March 26, 2016
Serial monogamy in camera ownership
You see it all the time. “I’m bailing on Canons, and switching to Sonys.” “So long. Nikon; hello Fuji.” I have never understood how some people approach buying cameras like getting married. Cameras are tools. They exist to make photographs. There are many kinds of photographs. Some cameras are suited to making a certain class… [Read More]
Testing for decentering by the numbers
Yesterday I posted the results of a fairly simple decentering test that requires only an ISO 12233 target, some lighting, a tripod, and a few minutes. Today I’ll show you what happens when you use a slanted edge sharpness analyzer — in this case, Imatest — on the images you saw yesterday. Here’s a crop… [Read More]