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I own a Nikon D90.

I am new to exposure setting. In Manual mode, I could see the exposure meter changing towards right of zero and towards left of zero informing about under exposure and over exposure. I clicked a few photographs as well. However, I do not know what happed, I now see that the exposure meter doesn't change in Manual mode. It seems to be stuck, i.e there is a bar that appears to the right of zero. It doesn't change, not matter where I focus. I initially thought it could be problem of the camera, so I switched to P mode and it was working fine there. I remember having used the Exposure Lock buttons AE-L/AE-F button and the focus lock switch. I tried to change their setting as well, but the meter reading doesn't change. I tried to do the following but none of this helped me fix this problem.

1) Reset the camera by pressing two green buttons at the top.
2) Removed the battery and inserted again.

This camera is just 2 months old. Could someone help me in understanding what has gone wrong. Why the meter reading is not changing in Manual mode?

(Added later)

Following is the various setting I am using to capture picture

Af-area mode to Single point
Metering: Spot

Based on the advice given here, I detached and reattached the camera. After doing this, I can see the Meter scale only for "S" and "M" mode in the Viewfinder

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2 Answers 2

Most probably your exposure is too much off. Cameras show only a few stops of correction, if that limit is exceeded they just display the maximum. Note the aperture, shutter speed and ISO that your camera uses in P mode and try using the same values in manual mode.

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Imre could you tell me how do I get an Overexposure reading. I focused my camera on a very well lit subject, but the reading still tells me Underexposed. I just need to make sure that the camera is working fine in manual mode. –  pradeeptp Dec 11 '11 at 10:42
    
In P mode I tried different aperture and shutter speed. I am getting good picture but now I do not see the exposure reading moving. Shouldn't it be in ZERO if the subject had a good exposure? –  pradeeptp Dec 11 '11 at 11:01
    
Try detaching the lens, wiping the contacts with a dry cloth, then reattaching. Could be a problem with the lens communicating with the camera. Also, does the meter change when in A,S, or P modes? –  ElendilTheTall Dec 11 '11 at 11:04
    
ElendilTheTall: I detached the lens and reattached. Now I something strange is happening. The Exposure meter scale is shown only for "S' and "M" Mode :(. In "S" Mode, The aperture is always "Lo", but I can see the meter reading change!. In "M" mode, the meter reading is not changing. –  pradeeptp Dec 11 '11 at 11:18
    
@pradeeptp - do you have a 2nd lens you can try, just to eliminate the option for lens problem? –  ysap Dec 11 '11 at 11:34

The manual exposure meter only displays when it's helpful to do so. Mainly when you have the camera in Manual (M) mode.

In S, A, P modes, the camera is calculating the exposure so you don't need it and it disappears.

It reappears in those modes only if you use the thumbwheels to alter the exposure past the range of valid apertures, shutter speeds or ISO. For example, in low light, if you have the camera in S mode and increase the shutter speed with the thumbwheel, the camera will compensate by using a larger aperture until it reaches the maximum aperture, then will adjust the ISO to the maximum. If you keep increasing the shutter speed, it will run out of options, reach max ISO and aperture, and that's when it displays "Lo" and the exposure meter appears to show you that you are now underexposing the image.

Imre is probably right that you have the exposure set past the limits of that exposure meter. As suggested, put the camera in P, S or A mode, note what settings the camera has chosen, then put the camera in M mode and change to those settings. You should then be roughly in the center of that exposure meter.

What lens are you using? If it's an older lens the camera might not be able to meter properly. Is it an AF-D or AF-S lens?

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Thanks MikeW for this information. I am using the Kit lens that I got when I bought Nikon D90. –  pradeeptp Dec 13 '11 at 15:49

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