Category Optically Adjusting a Lens | Lensrentals Blog

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 […]

Technical Discussions

5D Mk III AF points and 3rd Party Lenses

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First, for those of you who aren’t aware, the new AF system in the Canon 5D III has different available autofocus points with different lenses. Canon has listed all of their lenses in the 5D III manual (pages 78-84 for those of you who don’t do manuals much) telling you which of the 61 AF […]

Technical Discussions

Sensor Size Matters – Part 2

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Why Sensor Size Matters Part 1 of this series discussed what the different sensor sizes actually are and encouraged you to think in terms of the surface area of the sensors. It assured you the size of the sensor was important, but really didn’t explain how it was important (other than the crop-factor effect). This […]

Technical Discussions

Sensor Size Matters – Part 1

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We get a lot of questions about sensor sizes and crop factors.  Most people know the difference between a standard (APS-C) crop sensor and a full-frame sensor. Not many, though, know how much smaller a 2/3” sensor is than a 4/3 sensor, and fewer still the difference between those and a 1/1.8” sensor. Plus Canon […]

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