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09-14-2010, 02:08 AM   #1
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Pentax K-x, marks on certain photos

Hello!

I have a problem with my Pentax K-x (using the kit 18-55mm lens) from day 1 (around 6 months ago). Look at the following two pictures:

1) ISO400, F/22, 1/100s
http://178.63.26.210/~budalein/dwnld/Swe/_IGP2156.JPG

2) ISO100, F/3.5, 1/1000s
http://178.63.26.210/~budalein/dwnld/Swe/_IGP2157.JPG

Both photos were taken at 18mm focal length. As you can see the first photo has a few "marks" on it. Those marks appear on every 4th or 5th photo and I couldn't yet figure out why (the closest I got to is that using F/22+ makes them appear more frequent). I've tried the built in dust removal system with no success, but as the marks didn't appear on all photos I doubted that would help.

Did anyone have a similar problem? Could it be that the lens is dirty? If so, how come the marks don't appear on all photos? Unfortunately, I don't have any other lens to try.

Thank you in advance for any help given!

09-14-2010, 02:13 AM - 1 Like   #2
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Dirt on the lens or sensor.

The closed aperture causes your depth of field to widen so you capture the dirt as well.
09-14-2010, 02:40 AM - 1 Like   #3
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Kansas is spot on. The dust removal system isn't very good. The safest and cheapest solution right now is to get an air blower and give the sensor a good puff. The Giottos Rocket Air is highly recommended. I have a Giottos CoCo which is almost the same, and it has worked wonders to remove the stray dust on the sensor!
09-14-2010, 06:15 AM   #4
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QuoteOriginally posted by KansasHorizons.com Quote
Dirt on the lens or sensor.

The closed aperture causes your depth of field to widen so you capture the dirt as well.
QuoteOriginally posted by 0rangepeel Quote
Kansas is spot on. The dust removal system isn't very good. The safest and cheapest solution right now is to get an air blower and give the sensor a good puff. The Giottos Rocket Air is highly recommended. I have a Giottos CoCo which is almost the same, and it has worked wonders to remove the stray dust on the sensor!
I somehow thought this would be the answer Thanks for the help!

09-14-2010, 08:26 AM   #5
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Heres great write up of the subject written by a member: https://www.pentaxforums.com/forums/pentax-beginners-corner-q/109456-dirty-se...ml#post1128045
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