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08-02-2010, 10:09 AM   #1
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K-x - something on viewfinder?

Okay, Iím not sure I can explain this, but I will try. I recently noticed when looking through the viewfinder I see a pattern that looks like fingerprints. I tried changing lenses and it is still there. I can only see it when the background is light and I focus my eyes on the viewfinder and not on the subject. I really donít think it is fingerprints because it looks very symmetrical and appears to cover the whole viewfinder (or mirror?). I have not been able to see any of this on photos, so Iím not sure if that means itís just on the viewfinder.

Has anybody else noticed this? Itís obviously not very noticeable as I had my camera about 6 months before I saw it. Nothing has touched the sensor as I have been very careful when changing lenses.

Any thoughts on what this may be?

Bill M

08-02-2010, 10:27 AM   #2
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That would be the viewfinder screen, no need for alarm!
08-02-2010, 10:28 AM   #3
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The focusing screen is covered entirely in circular ridges, as you're suggesting. When using a small aperture (typically F6.7 or below), these become extremely visible.

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08-02-2010, 11:18 AM   #4
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Note the aperture only matters when using an M42 lens, though - with "regular" lenses for your camera (ie, K-mount), the lens stays at wide open aperture while focusing. But ther pattern does becopme more noticeable in certain types of light, also with certain types of subject, and is usually more noticeable with out of focus than in-focus areas.

Anyhow, these patterns are normal and necessary for a DSLR in order for the focus screen to be able to form an image at all. Some DSLR's have them less prominent (and therefore correspondingly less effective).

08-02-2010, 12:57 PM   #5
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Thanks for the info!

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