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Nikon DSLR Cameras
Out of Production DSLRs
D90
Need help on my D90
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<blockquote data-quote="pforsell" data-source="post: 613163" data-attributes="member: 7240"><p>That smudge seems to be on the focusing screen. Maybe it is a fingerprint? It will not show up in the pictures, and it is in the corner where it will not hamper metering, so my first advice is to just forget it.</p><p></p><p>As a matter of fact the smudge could also be on the mirror and just reflected up onto the focusing screen. Have you double checked the mirror? Even in this case it doesn't matter, since it is in the corner and won't affect autofocus. The reflex mirror is delicate and the silvering is on the topside of the glass, unlike your regular mirrors, thus it is <strong>very easily damaged</strong> by rubbing. </p><p></p><p>A cotton swab and some clean isopropyl alcohol with a steady hand would get rid of fingerprints or similar smudges.</p><p></p><p>In the worst case the smudge can be under the focusing screen and on the prism, but I wonder what that could be in that case... some kind of liquid spill? It does not look like fungus to me. I don't know if your camera has user-removable focusing screen, and even if it has there's probably shims between the screen and the prism that could get damaged, so I wouldn't try to remove the screen myself.</p><p></p><p>If the smudge isn't anything obvious, I'd let it be, unless you are comfortable fixing delicate things. It is probably not very cost-effective to have your camera serviced by a professional technician, since the cleaning effort might cost more than the camera.</p></blockquote><p></p>
[QUOTE="pforsell, post: 613163, member: 7240"] That smudge seems to be on the focusing screen. Maybe it is a fingerprint? It will not show up in the pictures, and it is in the corner where it will not hamper metering, so my first advice is to just forget it. As a matter of fact the smudge could also be on the mirror and just reflected up onto the focusing screen. Have you double checked the mirror? Even in this case it doesn't matter, since it is in the corner and won't affect autofocus. The reflex mirror is delicate and the silvering is on the topside of the glass, unlike your regular mirrors, thus it is [B]very easily damaged[/B] by rubbing. A cotton swab and some clean isopropyl alcohol with a steady hand would get rid of fingerprints or similar smudges. In the worst case the smudge can be under the focusing screen and on the prism, but I wonder what that could be in that case... some kind of liquid spill? It does not look like fungus to me. I don't know if your camera has user-removable focusing screen, and even if it has there's probably shims between the screen and the prism that could get damaged, so I wouldn't try to remove the screen myself. If the smudge isn't anything obvious, I'd let it be, unless you are comfortable fixing delicate things. It is probably not very cost-effective to have your camera serviced by a professional technician, since the cleaning effort might cost more than the camera. [/QUOTE]
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Nikon DSLR Cameras
Out of Production DSLRs
D90
Need help on my D90
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