Once in a while, my recently acquired used D90 doesn't respond to the press of the shutter release button. Half-press, full-press, neither works. I make sure the Automatic/Manual focus switches are all set to auto. that doesn't help. I turn it off and turn it back on again, then it works. I am using Nikon 18-105 kit lens. Please help.
Unless your unit is defective, by default most DSLRs will not release the shutter if:
- Focus has not been acquired.
- The flash is charging
- The buffer is full
1 and 2 can be over-ridden using the custom settings. If you go to MF or AF-C (which defaults to Release-Priority) you should not experience this due to #1. If the flash is down (and no flash is attached to the hot-shie), you your next experience this due to #2.
3 happens when the camera is waiting to write to the memory card. If you get a faster memory card, the limit can be pushed further but only up to a point. It happens if you keep shooting consecutive shots quickly.
Apart from the focus issue Itai already explained there is one other "feature" which can lead to this behavious:
If you put your camera into IR remote mode pressing the shutter on the camera does not respond.
I had the same problem. After a bit of research, I discovered that the 18-105 kit lens is not well made and has problems making a firm contact with the camera. Many times when the camera refused to take a picture (even if I went totally manual), I could get it to work by gently tightening the lens a bit. When I switch to a different lens, the problem disappears.
I just bought my D90 used (but it looks just like new) and it had the same problem.
All my auto buttons were assigned to auto and then I found one that was set to AF-ON under f4 Assign AE-LAF-L button. I tried different settings on that screen and ended up with the camera set at AF lock only. Now my half down focus works perfectly with every lens.
Let me go from the start so you know where this screen is at:
- CUSTOM SETTING MENU
- f CONTROLS
- F4 Assign AE-L/AF-L button
- AF lock only