D4 Sensor spot
Is it possible to have a dust particle in-between the sensor and the ir filter ?
Very very unlikely as the combination is made in a clean environment. I had a spot on a D300 filter that just wouldn't go away whatever I did eventually I ignored it.
Mike Chen wrote:
I tried that cleaned more time than I should it is not moving
I suppose one option for a dust spot that you can't get at would be to use the "Dust Off reference photo" feature. (on page 346 of your manual.) I've never actually used it but has been on Nikon bodies at least since the D2x. It lets Capture NX2 know where the spot is on all your shots and it automatically gets cloned out during raw processing. Must admit that I've never actually tried it though.
It's actually quite easy to tell if it's on the sensor (under the AA filter) or on the top of the AA filter.
A spot on the AA filter seen against an unfocused bright background (e.g. sky) will appear at high (small) apertures, and (mostly) vanish wide open as the light will some in from all around it.
A spot on the sensor itself as opposed to on top of the AA filter will always be present, as there's very little (if any) space between it and the photosite.
So shoot against an unfocused bright background at F16, and at F2.8 (or whatever is wide open), and if it's almost the same, it's on the sensor -- if at F2.8 it mostly disappears it's a normal spot on the AA filter.
Comments welcomed on photos: http://www.captivephotons.com
I have cleaned more times than I can recall
all other spots are moved except this one
so I can only think that this is on the sensor itself
so it is off to the nikon repair service centre