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Category Archives: Technical Discussions

Sony Goes World Class: The 24-70mm f/2.8 GM MTF and Variance Tests

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  I was one of those who noted Sony had some troubles, as manufacturers often do, with some of their first generation lenses for full-frame FE mount cameras. When they announced the G Master lens series I was really excited to test them. I was expecting Sony to have made progress both with optical quality and […]

LensRentals Tears Down the Zeiss Batis 25mm f/2 Lens

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LensRentals hasn’t been able to get enough copies of the Zeiss Batis lenses to even fill our existing orders, much less enough for Aaron and I to test and play with them. But one of our customers was kind enough to drop a Zeiss Batis 25mm f/2 lens the other day. Nothing looked smashed, but […]

Mythbusting: Parfocal Photo Zooms

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About twice a week I get a call from a photo-videographer wanting to know which photo zoom lenses in a certain focal length are parfocal (stays in focus while changing focal lengths). It’s understandable why they would ask; a superb photo zoom is 1/10th the cost of a good video zoom. They get pretty mad […]

How to Clean Your Camera Lenses (And Check For Problems)

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In the past, Roger has shown us time and time again, that internal dust and other artifacts rarely have an effect on the image quality produced by your lenses. With how complicated the optics in a lens are designed, lenses are rarely affected by these small flaws such as lens dust. That said, every piece […]