Troubling Grid Pattern on Images

I shoot a Nikon D2X - I've recently noticed a grid pattern on some images. It doesn't seem to be on all images, and the visibility appears to vary in intensity, but this may be due to image color, etc.

Has anyone else encountered such an issue, or have heard about such an issue.

If anyone knows of a way to post on these forums let me know and I'll post an example.

Maybe it's moire pattern? I see that tossed around in a lot of tests, but not really sure what it looks like. I had that happen to one of my images taken with an Olympus.

My Canon's have had "grids" show up at times...if I recall it was due to the lens motor being used (USM or not in Canon's case) which would cause some sort of interference in the image.

Not on all images, not under all conditions....and in the end I think it was the USM on my 50mm lens that was doing it.

Good luck :)

Thanks Richard and Robert. Unfortunately, it's not a moire pattern, and since I manually focus I wouldn't think it's caused my the lens motor, although I'll go back and look at images and see if there's a correlation to the pattern and any particular lens. Thanks for that tip, I had not thought about this being a lens issue. I was thinking more of a sensor issue.

Inexpensive filters will sometimes cause this. If you are using filters, take the filters off and see if the pattern shows up without them.

I recently had that problem with a new out of the box Canon 30D plus some posterization of all photos in the shadow areas. It was a camera problem and they immediately fixed it and returned it to me. So far it is working OK, but I mostly use it as a backup camera.

Hmmmm, filters. I don't use cheap filters, but that doesn't mean a filter didn't cause it. Again, I'll go back and see if there's any correlation to the images and filters usage - another great suggestion, Thanks!

Grace - Did they say what was wrong with your camera? Mine is presenting a perfectly square grid (or mesh pattern) image over the picture. It's light, but definitely noticable in the images in which it occurs.

Odd, to say the least. Is this a RAW image, or JPEG? And did you apply the v2.00 firmware update? Before it started happening?

These are RAW images. I haven't thought about the new firmware, but I think i remember this happening once or twice before I installed the new firmware. I'll check dates ti be sure. Thanks Les.

Bill, this happened to me once with my 20D. It can be caused if you underexpose. I was also shooting close to cellphone towers, so one theory was that interference from them could've caused that.

I did take my camera in for testing, and it didn't show any real problems as such.

Thanks all who responded. I justreturned last night and will start investigating more tonight. I will let you know what I find. Thanks again fo the ideas!