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Nikkor 35mm 1.8G
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If mine hunts, it's usually my fault for trying to focus on something that's blowing around in the wind, or something without enough contrast. No speed issues here.
Yeah, that lens is great-- if it has trouble, it's usually my fault.
I find that in certain situations (pre-dawn especially) that it has trouble focusing through panes-- like through a screen door or through a dirty window. Also, it tends to want to re-focus a lot, so I just take it to Manual when I need it to stop hunting.
I also have a D40, which I know doesn't have the most efficient metering/focusing system compared to the ones that use 3D focus (D90, etc). Do you have a D40/D60? That could be why.
Anyway, that lens is the best investment I ever made. Love it to death.
I find that in certain situations (pre-dawn especially) that it has trouble focusing through panes-- like through a screen door or through a dirty window. Also, it tends to want to re-focus a lot, so I just take it to Manual when I need it to stop hunting.
I also have a D40, which I know doesn't have the most efficient metering/focusing system compared to the ones that use 3D focus (D90, etc). Do you have a D40/D60? That could be why.
Anyway, that lens is the best investment I ever made. Love it to death.
Other than opening the aperture to it's widest value, autofocus is the realm of the body and its focus sensors and the light path. You can make sure the light path is clear, especially the mirror. After that, you need to figure out what focus settings are the best for your particular subject and body. Without knowing what sort of subjects you're trying to focus on at what distances in what modes with what sensors, it's difficult to say if you could have an equipment problem or a settings problem.
Paul
Yes. Sometimes it just spins back and forth. Try using autofocus on centre spot and try making the aperture tighter. When the DOF is too shallow, I think it can sometimes make the lens hunt a bit.
Unless I'm mistaken, I do believe that all lenses autofocus using their widest aperture and that the lens is only stopped down whilst it is taking the picture. Otherwise the viewfinder would be significantly darker and the autofocus would be slower because it has even less light to work with.
Yes, this is correct. Having enough light coming through the lens is critical for autofocus accuracy. Viewfinder brightness is also critical. The aperture will always be wide open until the picture is taken. The only exception to this is if you have the DOF preview on.