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Old Jan 14, 2011, 7:03 PM   #1
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Default Sensor cleaning on A200

Two weeks ago, I bought a 70-210mm F4 Beercan lens from Ebay. I was so happy since the lens looked very clean and in great condition. I took it outside to shoot a few landscape pictures to see it really worked. Well, the pictures looked great. However, there was a blue spot on the top left hand corner of the picture. It was really visible on pictures with blue sky as the background. I was worried at that moment thinking that there might be some mold growing inside the lens. So I switched lens and put on my 50mm F1.7 and took a couple shot at the same location. The same blue spot appeared all of the pictures I took as with the beercan. Now I know for sure the sensor is contaminated and sensor cleaning should be applied.

First I tried the procedure in the A200 menu to vibrate the sensor. With mirror in locking position, I used a small blower (rubber bulb type) to blow on the sensor. I could see there was a tiny black speck on the sensor but it would not come off no matter how many time I repeated the the above cleaning method. Out of desperation, I used a Q-tip to remove it and it worked. But it left a couple of lints behind. I repeated the cleaning method on the menu 3 more times and I finally was able to get rid of the lints. The sensor is now clean again.

Last edited by WCKSer; Jan 14, 2011 at 9:27 PM. Reason: Spelling
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Old Jan 14, 2011, 8:23 PM   #2
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Congratulations!

Using a dry Q-Tip would not have been my choice. If you dampen it in some distilled water, there won't be any lint deposits, but you'd have to wait a few seconds for the water to evaporate.
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Old Jan 14, 2011, 9:27 PM   #3
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thanks for the info, I will try that if I need to clean it again.
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Old Jan 15, 2011, 2:38 PM   #4
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Quote:
Originally Posted by WCKSer View Post
thanks for the info, I will try that if I need to clean it again.
Dampen is the right word.

Not "soak", not "wet".

As little as possible. And I don't trust Q-tips to be consistently clean when the kids could have been digging into them.

You might want to read this thread which is a few down the in the forum list. It has some good links in it.

http://forums.steves-digicams.com/so...ning-dslr.html

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Old Jan 23, 2011, 12:06 PM   #5
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I would first use a small blower like an ear syringe on the sensor. Then, take a shot of the sky if it's cloudless or a defocused shot of a sheet of white paper. If the problem is still there I would use a camel hair lens brush and if that doesn't do the job, use a lens tissue dampened with an alcohol based lens cleaner. The less contact with the sensor, the better.
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