This is a continuation of a series of posts that I started what seems like a long time ago about getting a book designed and published. The series starts here. A couple of weeks ago, I participated in a conference call with Jerry Takigawa, and representatives from both Hemlock (the printer) and Roswell (the bindery)…. [Read More]
Archives for 2016
Testing for decentering by the numbers with AF
Yesterday I posted the results of testing two lenses, the Sony 90 mm f/2.8 OSS G FE, and the Sony 70-200 f/4 OSS G FE, on the Sony a7RII. The tests were aimed at detecting and quantifying decentering, using visual appraisal, and showed both lenses to have minimal decentering. Today I’m going to show you… [Read More]
Testing for decentering visually with AF
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]
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]
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