I'll attempt a description of an odd event I'm experiencing when shooting with the K-5, DA 55~300 combination. At this point, I've not tried it with any other lenses. As near as I can come to the sound I hear from the lens, is a rapid fire focus motor machine gun. It's most often heard after having lost focus and is attempting to again achieve focus. It's difficult to assign any other specifics. I usually set the AF to 5 focus sensors when hunting BIF. I've found, however, that the described event can, also, happen when using spot focus. There is the usual "intermittent" factor that adds uncertainty in determining responsible circumstances. Thanks, much. :-) Jack
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