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I was shooting toddler portraits yesterday and got a little frustrated with my gear. I shot the first half with a Sigma 50 1.4 (HSM) with the camera in AF-Continous (since she was moving around so much). Everything went smoothly as expected. The second half was in tighter quarters, so I switched to a Nikon 35 f/2 AF-D. I was still in AF-Continuous and noticed that if I was holding the AF-on down while waiting for a good facial expression, the focus would push all the way to infinity after a few seconds, and at that time I would be unprepared to get the shot until it came back from infinity.
Long story short, is it generally better to use AF-D glass with AF-single rather than AF-continuous? Does AF-S glass function better with AF-C than AF-D glass? I normally use AF-single, but I felt like in this setting AF-cont would give more reliable focus. Is there a way that I could avoid this problem with a technique change?