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I'm looking forward to learning more about both the D3100 and photography in general.
Loving my D3100 I got from Xmass. Been shooting whenever I can. Looking forward to sharing and learning with you guys.
Unfortunately, there’s no setting to adjust auto-focus speed (because there’s no reason for anyone to want slower AF). Anyway, make sure you’re shooting with the optical viewfinder rather than LiveView. Nikon’s contrast detect AF in LiveView is notorious for being slow. Phase detect AF is always faster.
AF performance depends heavily on the lens. If there’s an focus hunting, then perhaps there’s just not enough light on the subject for the AF to lock on. You’ll need to put more light on your subject either with a flashlight or the AF-assist lamp.
If AF is very slow, then make sure you aim at something with a fair amount of contrast. The AF system will sometimes utterly refuse to lock onto a bland sky, for example, but it will hit a fleecy cloud or distant hills, and infinity is infinity as far as the image is concerned. At 35 millimeters and F2.8, an infinity setting will give you depth of field back to about 20 feet. At shorter focal lengths, it's even less critical. You must take great care with depth of field when shooting telephotos, and when you're up close, but the wider and farther you go, the less critical it becomes.
I find also that it's often easier to lock focus on the D3200 when I have it set to single point or dynamic area AF. The focus point is always in that center square of your finder unless you change it. You can lock to your subject in the center, and then, while holding the shutter button half way to hold focus, recompose as needed. If you set it to AFA and dynamic area, you get the benefit of single point focus most of the time, but if your subject moves, it will hold focus.
The 55-300mm lens also focuses pretty cleanly, but it is physically rather slow. Even if it does not hunt, it can take a good second or more to go from one end to the other. It definitely pays with this lens to pre-focus if you can, and even, under some circumstances, to go manual if shutter lag endangers your shot. As before, the camera seems quite able to go in the right direction if the focus point in question is findable, but the focal length range of 55-300mm is pretty long, and the motor is not blindingly fast.
Where things get complicated is when the scene is sufficiently out of focus, and focusable objects not available, that the camera does not know which way to go. It seems though it's still an open question here, that when it does not know what to do, it heads for infinity first, then turns around and heads back.
This can be a problem when aiming at a bug in a flower bed at a full 300mm, for example. If the AF doesn't catch the bug, it doesn't know what to go for next. You can solve that sometimes by widening the focal length of a zoom, getting at or near focus, and then zooming in.
If your camera is not level, and you aim up at anything, the perspective will be odd, with the object appearing to taper like a cone. The wider you go and the more off level you are, the worse it is.
Once upon a time on film, about the only solution to this was a shifting lens, rather exotic and expensive, or tilting the enlarger when one made the print. You can now correct perspective in software, and there's even a setting in the camera for this (at least there is in the D3200). But when you do this, it shrinks some borders, so make sure your shots are a bit wider than you need.
A surprising number of real estate shots aren't corrected, and they look bad.