Peter K. Burian | Photocrati

Q and A: How does the Autofocus Adjustment function work–and should I use it?

Question

From reading reviews, I know that some recent DSLRs, like my Pentax K-7, include an Autofocus Adjustment function that allows for modifying the AF system for more accurate focus with certain lenses. Is this function necessary? If so, how does it work? R. Webber

Answer

Yes, an increasing number of high-end DSLRs of several brands include a feature of this type. It allows for instructing the camera to focus slightly more closely, or to a slightly greater distance, than it would do at default. This function would be useful for an older AF lens-especially one that has been banged around-if it is no longer focusing accurately. You may find that it focuses slightly ahead of the subject, or slightly behind it; these issues are called “front focus” and “back focus” and they call for AF Adjustment.

Before using this in-camera feature however, be absolutely certain of the lens’s exact focusing tendencies. (more…)

Q and A: What is the best pro-oriented compact camera?

Question

I’m very happy with my Nikon D300 but I also need a smaller camera for hiking and for family outings when I don’t want to carry a heavy DSLR and lens. Are there any really fast/versatile cameras with built-in lens that would satisfy a serious photographer? I would want all the modes, overrides and RAW capture that you get with a DSLR? A.B.

Answer

In truth, no such camera is fully competitive with a DSLR in terms of versatility — especially in Continuous Drive speed — but there are three models that you should definitely check out while shopping. I have tested all three and found that they’re packed with advanced features, including numerous modes and overrides plus a RAW capture mode. (more…)