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Light Gray Spots on Photos
Old 01-15-2006, 08:41 AM   #1 (permalink)
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I bought a canon D20 about 6 months ago and now i have three light gray spots showing up on my photo's. Checked my lense's and they still have good clear glass. Have cleaned the sensor and still have the prob. Any sujestions. [img]/ubbthreads/images/graemlins/frown.gif[/img]
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Re: Light Gray Spots on Photos
Old 01-15-2006, 09:09 AM   #2 (permalink)
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I borrowed a friends Olympus a couple times and found a couple sqaure spots on photos. The camera as we found out later had bad cells in it. Could this be the problem? I don't know, but worth looking into.
HOPEFULLY, others here more knowledgable than I can tell you.
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Re: Light Gray Spots on Photos
Old 01-15-2006, 09:11 AM   #3 (permalink)
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if you post some of those photos pointing out the spots or enlarging them maybe we can help.
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Re: Light Gray Spots on Photos
Old 01-15-2006, 09:11 AM   #4 (permalink)
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Can you post an example?
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Re: Light Gray Spots on Photos
Old 01-15-2006, 09:41 AM   #5 (permalink)
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You need to clean the sensor. If you did the blowing things with a blower only, that is not sufficient. You must use one of the wet methods. This has been discussed many times across the internet. Blowing alone, just won't work. Here is a good link to a company providing the proper tools:

http://www.visibledust.com/

It is fairly expensive, but it is one of the methods that actually works. There are also sites which give you directions for making your own tools, etc.

Cheers,
rfs

PS: I've had my 20D for over 1 year and have cleaned it only once. If you are careful when you change lens, you minimize the dust that gets into the chamber.
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Re: Light Gray Spots on Photos
Old 01-15-2006, 10:15 AM   #6 (permalink)
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You may have a dirty sensor. Take a picture of a blue sky or a solid color with the aperture set to f/22 or something around there. If there are spots in the same place in picture no matter what lens are used, you may have dust on sensor. Take the same picture with the aperture wide to about f/4 and see no spots, then you still may have dust on the sensor.
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Re: Light Gray Spots on Photos
Old 01-15-2006, 10:30 AM   #7 (permalink)
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It's been repeated but regardless if you cleaned the sensor, it's caused by the sensor. Something is still on it. Condensation can build up collecting things. Your light gray spots could be a result of junk built up and not just a dust spec here and there.

J T
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I heard a rumor that...
Old 01-16-2006, 03:13 AM   #8 (permalink)
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...the 20D had an issue of too much lubricant in the mirror mechanism that could fly off onto the sensor. I don't think this is publicly acknowledged but I also heard that Canon would provide for free cleaning for the lifetime of the camera. If this isn't an acknowledgement of a problem I don't know what is.

I can't(haven't) confirmed that this may be a true problem with this camera.
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Re: I heard a rumor that...
Old 01-16-2006, 06:31 AM   #9 (permalink)
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[ QUOTE ]
...the 20D had an issue of too much lubricant in the mirror mechanism that could fly off onto the sensor. I don't think this is publicly acknowledged but I also heard that Canon would provide for free cleaning for the lifetime of the camera. If this isn't an acknowledgement of a problem I don't know what is.

I can't(haven't) confirmed that this may be a true problem with this camera.

[/ QUOTE ]

Hmm...I owned two 20D bodies for about a year,...I took tens of thousands of pics with each of them, and never had any problems such as what you are saying..

I too have had sensors "cleaned" by professionals, and have had the same globs of dust stay in place too.. The only thing that actually worked was very carefully using compressed canned air,...and I held the can upright..not pointed down.. I moved the camera around, not the can.. & I used the straw too.. It is highly warned against cleaning it this way, but it works.. I believe the reason why is because people get the liquid on the sensor..and that just screws up everything.. Best to pop the air before bringing the camera in front of it..so that no liquid comes out in the beginning..

BTW, I cleaned all my cameras like that, including my 5D & 1DMk2 bodies, and everything looks fine.

JP
 
 
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