This is the fourth in a series of tests on the Sony 100-400 f/4.5-5.6 GM zoom. The series starts here. The tests that compare two lenses visually have proven to be popular. While not as definitive as my quantitative testing, they do give an overall impression, and are easier to interpret for many because they… [Read More]
Sony 100-400 AF performance with a7RII
This is the third in a series of tests on the Sony 100-400 f/4.5-5.6 GM zoom. The series starts here. I have found the AF accuracy of the Sony a7RII to be outstanding, except in the case of two lenses. One is the Batis 85, whose longitudinal chromatic aberration (LoCA) seemed to cause the AF… [Read More]
Sony 100-400 OOF PSFs
This is the second in a series of tests on the Sony 100-400 f/4.5-5.6 GM zoom. The series starts here. There are two pieces to bokeh. The first is what things look like when they are well out of focus (OOF), and the second is how the transition from OOF to in-focus happens. The second is… [Read More]
Sony 100-400 Siemens Star test
Today, after a long wait, I received an FE-mount Sony 100-400 f/4.5-5.6 GM OSS lens. I’ll be reporting on it for the next week or so. First thing I do these days when I get a new lens is run the Siemens Star test on it, in order to detect manufacturing errors. The test is… [Read More]
Guest post on GFX adapted lenses
This is the 74th in a series of posts on the Fujifilm GFX-50S. The series starts here. When I was testing the GFX 50S, I did a lot of work with adapted lenses. I’ve received information about many lenses that I did not test from a reader named Robert Jones. I think it’s sufficiently interesting… [Read More]
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