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01-19-2010, 12:45 AM   #1
alphalt
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Black little spot in viewfinder

Hello all,

Yesterday I have cleaned my K-x sensor with blower and it was successful. Dust is gone, but not I see black little spot in viewfinder. I have searched the forums and find a lot of helpful threads how to remove dust, but how to know where this black spot really is ? Mirror ? Viewfinder ? Or just take out lens and blow inside ?

Regards,
alpha

01-19-2010, 02:31 AM   #2
Damn Brit
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If you take the lens off, you will be able to see if it's on the mirror. If it is on the viewfinder, it's usually best to live with it. More often than not, if you remove the viewfinder to clean it (which is a delicate operation) you put it back only to find more specs on there.
01-19-2010, 02:35 AM   #3
alphalt
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Hello,

Its too small I don't know if it will be possible to see, but I just try to blow out. If it will need some day to clean viewfinder itself then better I go to Pentax service
One more question: is it worth to turn on dust removal system on every startup of camera ?
01-19-2010, 02:38 AM   #4
Damn Brit
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QuoteOriginally posted by alphalt Quote
Hello,

Its too small I don't know if it will be possible to see, but I just try to blow out. If it will need some day to clean viewfinder itself then better I go to Pentax service
One more question: is it worth to turn on dust removal system on every startup of camera ?
If you send it to Pentax it will probably come back with more dust on the VF. It's something we all learn to live with.

I think most people set it to activate at startup, I do anyway.

01-19-2010, 02:41 AM   #5
alphalt
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QuoteOriginally posted by Damn Brit Quote
If you send it to Pentax it will probably come back with more dust on the VF. It's something we all learn to live with.


Thanks for tips.
01-19-2010, 08:06 AM   #6
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You can try blowing off the focusing screen, you may get rid of it, you may cause more of it, or you just might shift it around a bit.
01-19-2010, 08:17 AM   #7
alphalt
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Hello,

I blowed to mirror.... Now I have a lot of dust particles on sensor. After trying to blow dust from sensor it was partially succeded, but 3 particles is not possible to blow. What to do ? Clean with lenspen ? Or forget ? It starts to see on pictures from F14 and more. What do you think ?
01-19-2010, 12:12 PM   #8
Damn Brit
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If you have a tripod, mount the camera on it with the front facing down. That way you can use both hands to give a really good 'puff' with the blower. Just be careful not to let the tip of the blower touch the sensor. Also try actuating the dust removal a couple of times.

01-19-2010, 12:37 PM   #9
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We can only hope he used a rocket blower and not his mouth. The spots that don't come off might be spit.
01-19-2010, 12:48 PM   #10
alphalt
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Hello,

I was not using my mouth of course and it was not rocket blower. It was just regular blower from Unomat camera clean kit. Not the best I think, but still I used it. And really I've counter 3-4 dust particles that just can't come out. Instead of tripod I've used help of my colegue who help camera down. I was very careful and blower didn't touch sensor. Everything went quite well, but particles still remain. Have no idea what to do next. And really I don't know when sensor is "clean". Is is when camera dust detection function do not detect the spot or when you see nothing suspicious after taking white wall at F29 ? I think last scenario is barely possible after blowing dust. Isn't it ?
So what do you suggest ? Buy rocket blowers or lens pen or go to Pentax service ?
01-19-2010, 12:52 PM   #11
Ash
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You have the right idea about assessing sensor dust. If you can't see any spots on an image of a white surface or wide open blue sky at the smallest aperture setting, then your sensor is clean.

The best rocket blower IMO is the Giottos jumbo rocket blower:
Giottos Rocket Air Blower Review
01-19-2010, 12:55 PM   #12
alphalt
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In that case I have 2 spots which I need to remove. If dust is not removable by blower why it should be liquid or spit. What about static electricity ? I think these particles are just statically charged and thats why its impossible to remove them. Am I right ?
01-19-2010, 01:06 PM   #13
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The K10D/K20D/K-7 sensors have dust resistant coatings to the sensors that limit the static attraction dust have to the sensors - that's why rocket blowing is very effective. I believe the K-x also has this feature.

Stubborn spots can be removed by wet methods, which are specialised kits, not spit (definitely not!) or any other ordinary household liquid. I'm not familiar with them as I've never had a need for physical cleaning of either my K10D or K20D, but my K100D was a tough one to clean - even after multiple wet cleans...
01-19-2010, 01:09 PM   #14
alphalt
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Thanks for sharing info. I don't know how about K-x sensor is resistant to static electricity.... I'm considering to buy pentax sensor cleaning kit. Maybe it worth of trying ? I'm afraid of wet cleaning methods, but some sites recommend them (do with eclipse), so I'm totally lost.
01-19-2010, 09:50 PM   #15
Damn Brit
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Sensors aren't as delicate as people imagine them to be but it's wise to work on the basis that they are, it just makes you more careful, the sensor is the most expensive part of the camera.
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