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Category Archives: Lenses and Optics

The (sort of) Great 400mm Lens Shootout!

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I get asked a lot about different telephoto lenses. Is the 400 DO II better than the 400 DO? Which is better, the Tamron 150-600mm or the Sigma 150-600mm? You’ve probably noticed that I don’t answer those questions. The reason is simple. Our optical bench is designed to test lenses up to 2.5kg weight and […]

More PhotoGeekery: Finite Conjugate MTF Bench Tests for Macro Lenses

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For the last several years we’ve talked about the fact that lens performance can vary with focusing distance. Our optical bench tests at infinity. Computerized target analysis (Imatest and DxO) tests at close distances. But when the results of target analysis and bench tests differ it’s hard to decide if the difference is because of different testing […]

Sony FE Planar T 50mm f/1.4 ZA MTF and Variance Testing

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OK, you probably know I don’t like ultra-long lens names. I don’t like lenses that are expensive (who does?). So when you throw out a 50mm lens with a long name, like the Sony FE Planar T* 50mm f/1.4 ZA, and price it at $1,500 I’m a bit predisposed not to like it. Seriously, that’s […]