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Kx - Dust on sensor

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7samurai

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Need some advice.

I've already tried the dust removal 10 times and raising the mirror and blowing air using a Giotto rocket blower. Still got 2 spots that are causing small gray circles on pictures. They just don't want to move.

When i try the dust detection, it doesn't show anything at all.

Shouldn't the dust detection show the 2 spots? When I used it previously when I first got the camera, it showed a piece of dust that the dust removal quickly removed.

Should I try anything else before I send it in?

7samurai
 
Just double check it is not an issue with the lens. Obviously it won't be if you are using different lenses and the spots are still there.
 
Dust detection should show it if its on the sensor, it's very sensitive. It's obviously not your monitor dirty - only other option I can think of.
--
Regards Dean - Capturing Creation
 
Strange, the dust detection doesn't show any spots on the sensor. I've tried 2 seperate lenses and it shows the same dots in the exact same position.

Maybe I'm not doing the dust detection correctly. Am I surpose to set it to a specific f stop or point it at a feature less wall? I've been just accessing it through the menu system and selecting it.

7samurai
 
Obviously very small dusts. To better show the particles, take your photo +2EV at f22 or f32 if you can. Best to point the camera at a white surface (e.g. window frame), on manual focus at infinity to ensure a complete blur. The dust should show up nice and sharp.

You may have to acquire some cleaning devices (static brush, wet cleaning kit), it's scary to use for the first time, but it's quite simple actually.

Given the size of the dust particles I am not surprised that they aren't detected.

--
Roger
 
I had some stubbourn dust on my K2000, mirror lift up with a couple of pumps with a "blower brush bulb" cleared it all out; easy safe. I think the blower bulb plus the sensor cleaning action should take care of almost all cases, alleviating the need for wet cleaning techniques. I would only use the blower bulb if sensor cleaning doesn't work, just because I'm cautious.

Theoretically, it helps if you change lenses with your camera pointed "down" to help prevent dust from getting on the sensor in the first place.
  • Shel
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Thank you for the info. I've tried a bulb blower, but the dust still hangs in there. I may just send it into Pentax to clean. I'm working with mostly enlargements so these little dust particles stand out.

Anyone use one of the sensor cleaning kits with their Kx?
Pentax sensor cleaning kit?
Visable Dust?

7samurai
 
I find Visible Dust Artic Butterfly very good. Stubbon spots may have to be done twice.
--
Regards Dean - Capturing Creation
 
For goodness sake man, pull yourself together! I can't even see those spots on my monitor! If you saw my sensor you'd have a heart attack...

Now, dust is just a part of life for a photographer and sending your camera in every time you get a speck of dust on the sensor is not a practical soloution to your problem.

My advice would be to use the spot healing tool in your imaging software. It takes a second and is seemless. But i really wouldnt get your knickers in a twist over those spots. They will rarely be noticable unless you shoot high contrast blank skies at small apertures all the time...

Good luck
 
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