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| p.1 #8 · Ever clean dust out of the 5D viewfinder/prism? |
Did you try just blowing the heck out of it with a rocket blower? I have done that a couple of times for larger annoying dusts, and they usually come out. I don't know why it works, or if it should, just that it has. Maybe it's MAGIC.
In my experience, blowing with a rocket blower is the cause of much of this dust, not the solution. (I don't know why it worked for you, but I'm glad it did. I'd just urge caution for others.)
This dust is annoying, but I just ignore it and I barely notice it most of the time.