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01-30-2009, 09:59 AM   #1
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Need help with Sensor dust Issue

I have read every post on sensor dust but am baffled by this: What appears to be a dust spot on the sensor only shows up with one of my two lenses. When I use the other lens it disappears. Here are the specs:

K10d, sensor only cleaned with Rocket blower.

Lens#1: Tamron 17-50 f2.8 (new, super clean)
Lens#2: Tamron 28-105 f4 (used, but clean)

The spot only shows up on the 17-50. See sample shots taken with both of clear sky at f22.

If the spot showed up with every lens it would clearly be sensor related, but strange that it doesn't show up with the other lens as well. Problem is I live in Costa Rica so don't have access to photo venues where I can test other lenses.





If its clearly a sensor problem and the rocket blower isn't taking care of it I'm willing to take it to the next level but would like your thoughts first - has anyone had the same experience? Thanks to all!

Note: I am a new member, inserted photos but they don't seem to appear in the thread. Here is the url: http://picasaweb.google.com/mikenkiki/PentaxForum#5297129987401998482


Last edited by peter sellmer; 01-30-2009 at 10:03 AM. Reason: photos not appearing
01-30-2009, 10:06 AM   #2
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That is stubborn sensor dust spot. They tend to show more with some lenses. You may have to resort to a swab type cleaning of the sensor.
01-30-2009, 10:25 AM   #3
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Thanks, I thought that's what it was but wanted a second opinion before swabing!
01-31-2009, 03:42 AM   #4
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That's very similar to one I posted a month ago. I did eventually get it with the dust blower and no swabbing.

01-31-2009, 05:01 AM   #5
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yeah looks just like dust to me.. I have used the 'copperhill method' on a half dozen different cameras, of my own and friends without issue.. Just be carefull :-)
01-31-2009, 07:24 AM   #6
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Here is the link to the "Copperhill method for those that are interested (thanks Joele!):

Copper Hill Images - CCD/CMOS Cleaning Tutorial - Introduction
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