Having trouble nailing tack-sharp autofocus with your camera? Aside from technical proficiency, there are a number of other issues that could be causing you AF grief. Here’s a 14-minute video on 8 common AF problems and their solutions.
Photographer Steve Perry of Backcountry Gallery touches on: lens calibration, dirty AF sensors, wrong AF modes, AF guide inaccuracy, heat refraction, using the wrong AF point, dirty lens contacts, and poor technique.
from PetaPixel http://petapixel.com/2016/04/06/8-common-autofocus-problems-solutions/
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