In article <01bbcf21$221cbe00$365bb2c2@epsilon.epsilon.nl>, fdrent@epsilon.nl says...

>I've just bought a Nikon F90X. During my discoveries of this incredible
>camera I took a very close look at the mirror and it looked a bit dirty
>with some angles of view. From a distance it looks clean. How bad is this
>and is it 'normal'?

It sounds like you would be better off leaving it alone - unless
you know how to clean the delicate front-silvered mirror and/or
are willing to accept the possible hairline scratches resulting
from even a very careful cleaning. If you wish to proceed, this
is how I do it:
- wash hands in dishwashing detergent to remove oils
- gently breath up onto the mirror (to minimize spit marks)
- LIGHTLY, while rotating it, swirl a fresh Q-Tip over a
limited area of the mirror surface
- repeat, with fresh Q-Tips, until the whole surface is clean
(you may not need to go over the whole surface)
- if an area remains dirty, spray a slight amount of a
commercial glass cleaner, like Windex, onto a clean Q-Tip,
after which, clean the area again using breath
- remove the viewing screen, blow off the under side of the prism
gently, using a large hand air syringe, being careful not to
touch the mirror surface
- blow off the viewing screen, and replace it in the camera (do
not blow into the VF after this, or dust will be forced above
the screen, requiring removal of the screen to eliminate it)
Hope This Helps