From the description, I'd guess that there's something on the rear element of the 600. Or worse, near the rear element, where it might be hard to get rid of... If it's ahead of the focusing group it won't show up so clearly unless you really, really stop down (I'm not sure that the 600 can even do that).
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!
When you were shooting with the other lenses and not seeing the spot were you shooting at f11 or smaller? It could be dust on the sensor that I find I can only see at smaller apertures. If it caused by the lens I would think it would be pretty easy to see if you opened up the aperture all the way and shine a flashlight into the lens.
It seems that my evaluation was wrong. Today I used the D3s and the 70-200 and noticed the same shape in the same place on every image. So, it seems to be camera issue. However, it does not look like dust. Any ideas what this might be?
It looks larger than your average speck of dust, I'm not sure what the technical term for that might be other than a bit of something! But if it's on the sensor as it seems to be it really doesn't really matter what it is, you need to clean it off. It looks large enough to blow off with an air bulb-blower thingy.
>It seems that my evaluation was wrong. Today I used the D3s >and the 70-200 and noticed the same shape in the same place on >every image. So, it seems to be camera issue. However, it >does not look like dust. Any ideas what this might be? Could be a piece of dust which glued to the shutter blade, or to corner of the sensor. Try to use blower. I had such the trouble, when I changed the lens, this piece of dust moved with air. There is no lens which projecting its own imperfections, I mean dust, dirty elements, so on. In case of such the things only contrast and resolution really suffers, dirty covered elements could flare. Dimitri.
If that fails, a wet clean with one of the various fluid and pad combinations appears in order. I earn money with my D700 cameras and have them checked out about twice a year -- synch, etc., and the otufit I use cleans the sensor as part of the service. Fortunately you can clone a small spot out or if you use CS6, content aware it away. But that's a pain if you have a lot of frames and impossible if you have critical image elements in that spot. And yes -- I agree -- very nice image indeed.
I thought it was a lens problem, but it turned out to be a camera problem and a simple dust issue. I usually use a blower before I install the lens, but I have the opening facing down. This time I had the sensor facing up and took more time and care to blow on each corner.