A65, Wide angle zooms and back focus

Started Oct 12, 2012 | Questions thread
Marco Cinnirella
Marco Cinnirella Veteran Member • Posts: 6,440
Re: A65, Wide angle zooms and back focus

Michael W00d wrote:

Wide-angle lenses can mis-focus because the depth of field is so great that it fools the AF system.  I found that happened occasionally with the A700 and the Sigma 10-20mm lens if the focal point had low contrast. However, the same lens has behaved perfectly with my A77. In any case, at wide FL settings I find manual focus is preferable because it enables one to select a depth of field that is suited to one’s requirements.

Michael - thanks for letting me try out your 10-20 - I was impressed enough to get hold of one and it is working well for me on my a57

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