jcolwell Offline Upload & Sell: On
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p.1 #3 · p.1 #3 · How to test crop body+500mm+1.4xTC AFMA without thermal effects? | |
I test my 500/4L IS indoors at about 12.5m (40'), with and without extenders. Later, I do some spot checks outside at longer distances and it always seems to be OK.
I use the LensAlign II target. The camera is tethered to a notebook running EOS Utility. I achieve initial focus lock using the AF button on the camera (while looking through the OVF), and then go to LiveView on the notebook to evaluate the location of sharp focus, and make adjustments (+/- AFMA single steps), using the "<" and ">" LiveView focus controls in EOS Utility. I record the number of > or < steps (+ or -) as the AFMA value in the camera, and I'm done.
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