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The D90 has three different autofocus modes. In the AF-S mode it will not shoot until it has focused. In the AF-C mode it will shoot when you press the shutter release button even if has not focused. In the AF-A mode the camera switches between the AF-S and AF-C modes so either can apply.Also, bear in mind that the camera doesn't really know what you're taking a picture of. It may focus on something other than your subject. If you're in the single-area AF mode then you control which of the eleven focus points the camera uses. In any of the dynamic-area AF modes the camera decides.For full details on how the various modes work, please consult your manual. You might also check out the Nikon D90 video tutorial.
Nikon F mount (with AF coupling & AF contacts)
• D-type / G-type AF Nikkor (except IX-Nikkor): Autofocus and all functions possible • PC Micro-Nikkor 85mm f/2.8D: Usable in Manual exposure mode • AF Nikkor other than D-type (except AF Nikkor for F3AF): All functions except 3D Matrix Metering possible • AI-P Nikkor: All functions except 3D Matrix Metering and autofocus possible • IX-Nikkor: Cannot be used • Non-CPU: Usable in Manual exposure mode (exposure meter cannot be used) Electronic Rangefinder usable with lens with maximum aperture of f/5.6 or faster.
On the D7000 you need to press the button on the side of the camera that's in the middle of the AF/M switch and then you use to switch to decide whether it's in 1 point autofocus (hence forth called AF), 9 point dynamic area AF, 21 point dynamic area AF, 39 point dynamic area AF, 3D tracking AF or auto area AF. If you need more help with switching AF modes let me know and I can help you out =)
Hi taylorrm, I don't know if you have a solution to this but sometimes the AE-L/AF-L but gets pushed which is the auto focus lock button then the shutter release button cannot be used to focus and yu have to reset by pressing it again. Even though it's confusing at first it's a feature along with the AE/AF Lock to try out to lock your focal area on a subject prior to shooting.
check to make sure the switch on the camera body is switched to AF instead of M mode(looking at the front it's on the lower right hand side below the lens release button), which sometimes happens when changing the lens - so then the mode selected is in P,S,A, or M modes on the mode dial. happy shooting,
Here is Nikon's specs of lens compatibility for the D40X:
Compatible Lenses*: Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor: 1) AF-S, AF-I: All functions supported; 2) Other Type G or D AF Nikkor: All functions supported except autofocus 3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus 4) Other AF Nikkor*â¹/AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II 5)
Non-CPU: Can be used in mode M, but exposure meter does not function;
electronic range finder can be used if maximum aperture is f/5.6 or
faster 6) IX Nikkor lenses cannot be used *â¹ Excluding lenses for F3AF
AF after cleaning cycles??????????????????????????
AF means that the scanner flatcable is not connected to the main pcb (When powering up you should hear a grinding sound from the scanner area). Open the scanner cover as for changing the ink carts. Open the small cover (looks like a " L ") and connect the white flat cable simply by pushing it into the main pcb.
Perhaps you're doing something wrong or skipping a stage in the configration. You can find the exact way to change the AF area here:
Hope this solves your problem.