Spread it around evenly over the entire circle of the wheel. You want a fairly thick lubricant for this wheel, but just a tiny dab will do. A drop or two of grease (I prefer white lithium) applied to the wheel with a toothpick should do the trick.

It's the red wheel visible through a cutout in the metal chassis. This wheel can be accessed on many Nikon cameras by removing the floor plate of the camera. The first is that the main drive wheel for the shutter/mirror cocking mechanism is dirty or needs lubrication. Were I in your shoes I'd probably have another stab at it.Nikons from that era (D40, D50, D60, etc) have a couple of things that are fairly well known to cause the dreaded 'Shutter Error' and/or locked up mirror. I always do as well and mostly successfully - though now and again one must accept failed attempts. One email quote for cleaning is $200, almost 50% of the price I paid for the body.Īlright Peter, it did not work out this time for you but you should give yourself a pat on the back for being willing to have a go at the problem. I suspect attention to technique in covering the lens mount once I go the screen out might have helped. Getting the focus screen out and cleaning it was successful.īut in the process and/or as a result of blowing I got a bigger piece of something (?) in there. I started with specks on the focus screen itself. its been there since a couple months after I got it its not on mirror and I have been debating trying to remove and clean focus screen but do not want to make it worse than it is. My D7200 has one little black spot just to right of center that bugs me. Peter all in all is it worse now than when you started messing with it? Ps I did some searching of dpreview and elsewhere and there quite divergent views on what is advised. It doesn't affect photos but it is very distracting in the finder. It wasn't on the removable screen but the fixed part with the focus point marks ([pentamirror). Later, after reassembling I noticed I had another, bigger piece of dust in there. I took out the focusing screen and was able to blow away those dust particles. I had some specs visible in the viewfinder and it seemed they were on the focusing screen. Q Is it safe to attempt to wet swab it off with a sensor cleaning swab or similar? Or best to get it done professionally? Looks like it is on the mirror box side though. It is possible it is on the other side of the pentamirror I suppose ie in the cavity above rather than the mirror box.

I've tried a rocket blower but it won't shift. I have a question(s) about how to approach cleaning for dust visible in the viewfinder of D3300.Ĭurrent problem is what appears to be a largish fleck of dust (skin?) which is, I think stuck to the underside of the pentamirror (?) screen (ie the screen with the AF marks on it) not the perspex (?) piece which can be removed.

Nikon f90x clean lcd viewfinder