Need help with Sensor dust Issue

peter sellmer · 01-30-2009, 09:59 AM

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

wildlifephotog · 01-30-2009, 10:06 AM

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.

peter sellmer · 01-30-2009, 10:25 AM

Thanks, I thought that's what it was but wanted a second opinion before swabing!

GeneV · 01-31-2009, 03:42 AM

That's very similar to one I posted a month ago. I did eventually get it with the dust blower and no swabbing.

joele · 01-31-2009, 05:01 AM

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 :-)

peter sellmer · 01-31-2009, 07:24 AM

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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01-30-2009, 09:59 AM	#1
peter sellmer New Member Join Date: Jan 2009 Posts: 11	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
wildlifephotog Inactive Account Join Date: Nov 2008 Location: USA Posts: 924	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
peter sellmer New Member Join Date: Jan 2009 Posts: 11 Original Poster	Thanks, I thought that's what it was but wanted a second opinion before swabing!

01-31-2009, 03:42 AM	#4
GeneV Veteran Member Join Date: Oct 2008 Location: Albuquerque NM Photos: Albums Posts: 9,830	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
joele Veteran Member Join Date: Sep 2006 Location: Melbourne, Australia Photos: Gallery Posts: 1,308	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
peter sellmer New Member Join Date: Jan 2009 Posts: 11 Original Poster	Here is the link to the "Copperhill method for those that are interested (thanks Joele!): Copper Hill Images - CCD/CMOS Cleaning Tutorial - Introduction