Category Autofocus Reality Part 2: One vs. Two, Old vs. New | Lensrentals Blog

Technical Discussions

Autofocus Reality Part 2: One vs. Two, Old vs. New

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The first part of this series confirmed what we already new: Live view focus is more accurate than phase detection AF. This part is going to (sort of) look at something I’ve wondered about along with some related old wives’ tales. And unlike the first article, at the end of this we’ll have learned something […]

Technical Discussions

Autofocus Reality Part 1: Center-Point, Single-Shot Accuracy

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Once upon a time I wrote an article attempting to explain phase-detection autofocus and its limitations. That was a lot like trying to explain what happened to the Mary Celeste or why Stonehenge was built. Actually we probably have a better handle on the Stonehenge thing than we do on the Mary Celeste or phase-detection autofocus. So […]

Lenses and Optics

Canon’s 18-135mm IS gets an STM Makeover

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So the usual happened today: I read in a couple of places that the Canon 18-135mm IS STM lens isn’t going to be available in the U. S. for a while. A few minutes later Tyler walks in my office with one, asking if I want to test it. Let me be clear where I’m […]

Lenses and Optics

Optically Adjusting a Lens

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I write a lot about the fact that every copy of a lens is slightly different than every other copy. Now don’t get me wrong: I’m talking slight differences that are barely detectable, not good or bad. Even when things appear to be in the “bad lens” area, they usually aren’t. The majority of the […]

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