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Category Archives: Resolution Tests

Why You Can't Optically Test Your Lens with Autofocus

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By far the most common email and PM I get basically says, "I think my lens is optically out of sorts. What do you think?" The second most common is, "So what's the best way to optically test my lens without a ton of equipment." Years ago I wrote an overly long post about testing [...]

There Is No Perfect Lens Test, Either

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In my last article, I wrote about the fact that every copy of a given lens has some bit of sample variation. This affects lens reviews, whether lab-based or photography-based, because the copy they tested will be just a bit different from the copy you buy. I suggested, that if you want to get a [...]

First Look: Rokinon 24mm f/3.5 Tilt-Shift Lens - Part 1

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The release of the Rokinon 24mm f/3.5 Tilt-shift lens (also branded as Samyang or Bower) has created quite a bit of excitement. For Canon and Nikon shooters, it offers a 24mm tilt-shift alternative for around half the price of the brand name lenses. For shooters of other systems, it offers a tilt-shift option they may not [...]

Zeiss ZE 135mm f/2 vs. Canon 135mm f/2L

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We had a chance a few days ago to look at the first copy of the Zeiss 135mm APO-Sonnar CP.2 lens, but today received several copies of the 135mm APO-Sonnar in ZE (Canon) mount. I've been wanting to play with it personally, of course, but more to the point wanted the chance to test multiple [...]

First Look: Zeiss CZ.2 70-200mm T2.9

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Ah, as if the 70-200 zoom field wasn't crowded enough, with each camera maker having one or four along with the Tamron 70-200 f/2.8 VC and the Sigma 70-200 f/2.8 OS, but Tyler decided we have to stock yet another one. So today I have to test yet another 70-200mm, the Zeiss 70-200 T2.9 CP.2. [...]