badlydrawnboy Offline Upload & Sell: Off
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thw2 wrote:
Did you use the same AF distance in FoCal and your shots above?
Next, set lens at f/1.4, mount camera and lens on tripod, point at contrasting test subject at your favorite AF distance, carry out a series of half-presses and watch the distance scale. Does it wander all over? If it does, problem most likely lies in Sigma lens since 5D3 is very consistent with Canon lenses.
Last thing to try: ignore FoCal's recommendation, dial in your own adjustment, e.g. +10, and take several shots at the usual AF distance for consistency, adjust your correction if necessary and repeat. Once it's OK, try on your intended subject.
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No. The recommended distance from the target for microadjustment is 50x the focal length of the lens, which comes out to about 69 inches (close to 6 feet). The "real world" shots I took were closer to 4 feet.
I'll try what you suggest next. I will also try shooting with my Canon 24-70 II today to see if it has AF issues.
FWIW, Reikan responded to my email about this and said that it is possible for a lens or camera to perform well in an AF test with a static target, but not in real world shooting.
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