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Old Jul 22, 2009, 9:44 PM   #1
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Default Getting rid of dust specs in sensor, focus screen, mirror & Pentaprism.

Well, I got a used K20D today and the guy I got it from was correct, there was a LOT of dust specs in the viewfinder. My Gosh, his photo's had to suffer too as there was dust on his Sensor too as there were a lot of spots in the photo. No wonder I got it so cheap at $450! But he didn't mislead me as he did say there was a lot of dust particles. (other than that the body was flawless).

I couldn't stand that and since I build computers, I figured I fix it myself.
It took me 5-6 hours to do it as there was not only dust on the sensor & focus screen, but on the mirror & Pentaprism as well. So I had to clean all four.
Sometimes I got more dust specs after doing it, but finally got it PERFECT!

Here what I used, (didn't use the cloth) I took the focus screen out and looked at up at the sky with the magnifying glass.


I set the camera at smaller lens aperture settings (higher f/numbers) and shot into the blue sky and white paper to see the particles I needed to get rid of. I had to do this at least 8 times before I got it perfect. Then I had to go to work on the focus screen, mirror & Pentaprism.

What it looked like before on the sensor... the viewfinder/focus screen dust was a lot worst.



What I finished with... Perfect, no dust specs anywhere in viewfinder or photo!



Well, the gamble paid off as this camera is like new now. There were no blemishes or scratches anywhere on the body.
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Old Jul 22, 2009, 9:49 PM   #2
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Nice work Jack. In case you were not aware of it, the K20D has a Dust Alert feature where it can take a photograph of the sensor and display any dust via a digital image on the LCD screen. The dust shows up as black specs against a white background. Also the image is shown reversed so that you can pinpoint the location. The manual explains it all!
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Old Jul 22, 2009, 9:56 PM   #3
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Quote:
Originally Posted by jelpee View Post
Nice work Jack. In case you were not aware of it, the K20D has a Dust Alert feature where it can take a photograph of the sensor and display any dust via a digital image on the LCD screen. The dust shows up as black specs against a white background. Also the image is shown reversed so that you can pinpoint the location. The manual explains it all!
No I wasn't aware of that as I just got the camera today and spent the day cleaning it.

I had the K10D before this and absolutely loved it and was aching for the K20D, so I'm a happy camper. Now I gotta read the manual and start using it!
Here are some pixs I took with that K10D:
http://www.wunderground.com/wximage/jackmoskovita/
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Old Jul 22, 2009, 9:57 PM   #4
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You're just like me Jack. I'd much rather do it myself than pay someone!
You got a good deal too!
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Old Jul 22, 2009, 11:48 PM   #5
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Well done, they charge $65 for a dry clean down here.
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Old Jul 23, 2009, 12:09 AM   #6
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I need to do something about the focus screen in the K20 - it's starting to pick up some dust. I hate taking it out, not because it's difficult (it's quite easy) but because it's so easy to scratch! But it's getting to the point where it's starting to annoy me so I guess I better get the air blower out.

Whoever sold it to you didn't know how to change lenses using two hands, or else he did but changed lenses facing into the wind (done that too on occasion).
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Old Jul 23, 2009, 12:24 PM   #7
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Quote:
Originally Posted by jelpee View Post
Nice work Jack. In case you were not aware of it, the K20D has a Dust Alert feature where it can take a photograph of the sensor and display any dust via a digital image on the LCD screen. The dust shows up as black specs against a white background. Also the image is shown reversed so that you can pinpoint the location. The manual explains it all!
I had need to clean a rather large speck of dust off the sensor in my K200D. I used the Dust Alert to confirm where it was and following advice from the salesman where I bought the camera, I set the camera to B to raise the mirror, held the camera pointing downwards and used a rocket blower to clear the dust speck. Using Dust Alert after confirmed the speck was gone and a couple of test shots came out fine.

I wish I had been referred to the manual by the salesman or at least checked it myself, as the manual does not recommend the B setting but rather to use Sensor Cleaning which raises and keeps the mirror up. As I did take some test shots, I don't think anything terribly wrong was done to the camera but in future I'll follow the method outlined in the manual to be on the safe side.

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