| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4424 |
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Hi and welcome to the forum.
I have a couple of D1x's and other member also have and use them. It's nothing to do with the DX crop factor, that's for sure. The D1x behaves exactly as you would expect any camera to.
My immediate reaction is that the lens indexing mechanism may be damaged. When you view the image you should be seeing the image with the lens aperture wide open, when you make your exposure the lens should stop down.
If somebody, a previous owner, has fitted a pre-AI lens they may have damaged the indexing mechanism when it jammed, it's possible to fit a pre AI lens but a swine to get it back off and can do damage such as you describe.
There is a 'preview' button on the left of the lens looking at the front to the camera. Pressing that should stop the lens down to the pre-determined aperture to allow you to see the effect of the depth of focus. Try pressing that and check if the lens is stopping down as expected. I think your lens is not opening it's aperture to the expected amount.
It could also be oil on the iris blades?
Needs more thought and discussion to eliminate false ideas.
Maybe I am wrong, but the failure of the lens to stop down at exposure would result In over exposure.
The op is effectively saying the D1X is underexposing...hence the need to lift ISO and shutter speed.
The first thing I would do is a 3 button reset on the camera then try another lens.
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Eric