Dirt through the viewfinder, but not on images

[GaryK26]

I have just noticed a speck of dirt / dust when looking through the viewfinder of my 40D. Thing is, it does not appear on any images - even an image of white paper @ f32.
It's not lens specific and I have cleaned the viewfinder eyepiece.
I'm not using the dust map (Dust Delete Data) feature of the 40D either.

Any ideas / suggestions?

Thanks
Gary

[Paranormalist]

If I'm not mistaken I've read about somebody else on here having the same issue with the 40D. Can't remember who it was though.
Sorry I can't be of more help.

[Paranormalist]

I've found the thread.

Canon 40D Minor Fault , Advice Appreciated

[Yandros]

If it's sharply in focus it's probably on the focussing screen (the screen above the mirror). If it's blurry, it's probably on the mirror. A blower should shift it in either case (be careful not to touch either screen or mirror though).

Gunk on the focussing screen is a perennial problem though, and if it's not too distracting, it's probably not worth bothering with.

[GaryK26]

IQ is not affected in any way whatsoever.
It's just annoying - especially as I've only had the camera for 2 weeks.

I tried a rocket blower yesterday - at the sensor though as that was before I had deduced that it probably wasn't the sensor. Not sure whether to just leave it as is (as suggested) or to maybe give the inside a good blow with the mirror down.

[daveleeuk]

not sure how much help it will be for a viewfinder but maybe

LINK

we use them for sensor cleaning and they are excellent

[Liquid101]

It's either on the mirror, or more likely on the ground glass screen directly above. Either way, a direct blow with a rocket should shift it.