David Cardinal: Saving Your Photo Safari with Datacolor’s SpyderLensCal
Jun 2012 10

A common complaint among serious photographers is that their cameras don’t focus accurately. “Back-focus” and “front-focus” are both dreaded ailments that can plague any SLR (digital or film) and lens combination. Fresh from the factory, lens and camera are supposed to be calibrated so this doesn’t happen. However, not only does that not always occur, but once a lens and camera are in the field, it is only a matter of time before slight changes in the alignment can cause focus to drift.

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Gianluca Colla: Reasons To Calibrate Autofocus (Part 2)
Oct 2012 09

Now that we have seen in this article why we need to calibrate the autofocus of our camera/lens combination (CLC) let’s see how to do it. In a nut-shell, we point the camera at the SpyderLENSCAL, we focus on the vertical target, take a picture, and by zooming in the picture (on the camera display or, better, on a computer screen) we can verify on the ruler whether the front or rear section is sharper (ideally should be the zero, but….) In case the numbers in the ruler’s front area are sharper than zero, then the lens is ‘front focusing’, in case the numbers on the rear are sharper, then the lens is back focusing and we can use the in-camera menu to fine tune the focus. That’s the quick explanation, let’s go through the in depth process.

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