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12-08-2014, 03:50 AM   #1
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Annoying mark on some pictures - help please!

Hi all,

using a K-30 (for around a year now) and have noticed some marks appearing on some photos. Always the same mark, in the same place. But not on all pictures, just some! Makes no difference which lens I'm using, so can't be that.

Would this be a dirty sensor? If so, do I need to get it cleaned professionally? And how come it doesn't appear on every photo?

Some examples follow. See the mark in the top left quadrant.

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12-08-2014, 04:00 AM - 1 Like   #2
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Yes. those are sensor dust. You should be able to clean them with a sensor blower.

You should see your user manual about how to clean the sensor.

You can find some ideas here.
https://www.pentaxforums.com/forums/58-troubleshooting-beginner-help/271116-l...ning-tips.html

Sensor dust become more pronounce with smaller apertures. That is why you will not see them in all photos

Last edited by Culture; 12-08-2014 at 04:06 AM.
12-08-2014, 04:37 AM - 1 Like   #3
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yes sensor dust, higher F stop , more visible.
you can clean it with a blower, anable sensor cleaning on power on and off on your K-30
12-08-2014, 05:10 AM - 1 Like   #4
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To find the dust most clearly, take a photo of blue sky at f22 with the lens focused to infinity (use manual focus with the ring turned all the way out). Usually easiest to get only blue sky with a longer focal length.

12-08-2014, 08:32 AM - 1 Like   #5
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Just find your sensor cleaning function and blow the dust with a rocket blower then turn the on/off switch to off. Never remove a lens while your camera is on, the static will attract dust into your camera.
12-08-2014, 11:06 AM   #6
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Original Poster
Thanks all. I've bought a Giotto Rocket Air blaster this afternoon, and am charging up the battery right now. Will attempt to air blow this away later on. As a matter of interest, can anyone explain why this doesn't seem to appear in every picture?

Edited:

I've now blasted some air - and test shots suggest it's gone. Many thanks!

Last edited by kentishrev; 12-08-2014 at 11:43 AM. Reason: updated
12-08-2014, 09:20 PM   #7
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It shows most clearly on a solid background at a small (large number) aperture. A pure blue sky is the easiest to see it in.
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