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10-02-2009, 11:30 AM   #1
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Inspection after sensor cleaning?

A week ago or more I had some heavy dust issues in my K20D.
It was not able to eliminate with the build in dust removal shake function through the menu.

I spend all afternoon, with the remidies at hand, trying to solve this.
I used a brush and airball with marten hair (I think).
My magnifier for looking in was an 8X magnifier as the one used for negatives on a lightboard.
I also had had a magnifier for when repairing watches.

Since the dust issue stayed there, even though moving from one area to another on the sensor, in the end I grabbed something I should never have done, A handheld battery driven compressor.

Auch.
It removed the dust but small particles of oil was blown out together with the air and they were now stuck on the sensor.

So I left my camera on the shelf and went on eBay and other places ordering Eclipse E2, Sensor Swab 2, Giottos Rocket Air Blower and some Pentax original cleaning thing working as a sticky thing to remove known spots on the sensor.

To day I got the Eclipse E2 and Sensor Swabs.
So I started cleaning sensor.
And it obviously helped.

Inspection is done by photographing a clear blue sky and go 100% on a good CRT screen.
Cleaning were done in 3 tempi with inspection in between.
Less and less spots occured on the clear blue sky photos.
Every inspection consisted of 2-3 photos of different parts of the sky without taking off the lens.
Last inspection today showed a completely spotless sky on the first shooting.
However, on second photo I found a spot on the sky that could look like dirt/oil.

My Question is:
If inspection photo #1 is spotless and inspection photo #2 have a spot, will this spot be some element on the sky, like a very unsharp bird or insect?

Or am I doing this all wrong?

Niklas

10-02-2009, 12:13 PM   #2
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Niklas,

Sounds like you're on the right track. To take your inspection level 1 step further, try importing the image into photoshop, desaturate and running and auto levels. Take a few shots and compare them side by side. Anything that is on the sensor, or lens for that matter, so show up consistently in both.

Cheers
10-02-2009, 12:38 PM   #3
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At wide open apertures, dust spots can hide.

Stop the lens down, and shoot the sky. You should be able to see teh dust then.
10-02-2009, 12:41 PM   #4
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QuoteOriginally posted by KungPOW Quote
At wide open apertures, dust spots can hide.

Stop the lens down, and shoot the sky. You should be able to see teh dust then.
I stopped down to f8-16 depending on lens.
And between every cleaning I had a different lens on just to make shure the lens wouldn't fool me.

Niklas

10-02-2009, 12:44 PM   #5
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You're on the right track Niklas.
I would stop down even further to be sure of the dust spots - like f/22.
The dust spots should be in the same spots in each shot regardless of lens and what's in the sky.
10-02-2009, 08:42 PM   #6
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Perhaps I missed something, but what about the dust alert feature on his K20? Would that not pick it up?
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