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Photography Question 
Jill M. Higgins

Canon 20D - Gray Spots on Pics - Help!

I'm having trouble with light gray (almost translucent) spots showing up on the pics I take with my Caonon 20D. Can't see anything inside.

I just got my camera back from Canon for having the same problem fixed. Now I have a gray spot in a new place.

My two other friends who have the 20D have the same problem. Does anyone know what is causing this or what to do about it?

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8/21/2005 5:39:32 PM

Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
  Dust on the sensor.

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8/21/2005 6:24:32 PM

Jill M. Higgins   What do I do about it? I blew air in and even did a sensor clean. Doesn't help.

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8/21/2005 8:36:16 PM

George Anderson   Buy a film camera, ha!

Seriously, back in the day (with film SLRs) my camera tech always taught me never to blow air into the body or mirror box of a camera, since you would just spread the dust/dirt throughout the camera. This dust would inevitably would work its way back onto working parts or lens/mirror surfaces.

They used to make a very low-power battery-powered vacuum specifically made for cameras to gently suck dust out of the camera interior, don't know if this would be useful for DSLRS.

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8/22/2005 5:07:56 PM

Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
  yes, dust magically dosen't get inside film cameras or on to film and negs. Could also be dust on the back of the lens, but that dosen't usually show up. Cleaning again is about the only thing you can do. Even sending it to somebody sometimes only results in moving a dust particle to a different spot.
You can buy the pec pads and the eclipse cleaning solution. It's mostly methanol so it evaporates quickly and is less likely to leaves streaks and spots. There's also the swabs made for cleaning the sensor. But you can make your own.
If make sure it is dust, take a picture of the sky or a white wall at a very small apeture and see if the image on your comp has the spot getting more defined. Dust can disappear at large apetures, but at f/22 will show clearly.

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8/22/2005 9:13:07 PM

Antony Burch
BetterPhoto Member Since: 3/23/2005
  Jill, look here it may help

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8/23/2005 5:19:14 AM

Glen Taylor   It's a real problem. My DSLR-owning friends are getting to where they won't even take the lens off the camera anymore. I guess that explains why maxi-zooms are so popular on these cameras.

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8/23/2005 9:19:13 AM

Jill M. Higgins   Thanks for all the feedback - I'll go check out the website. I guess I just need to be really careful about changing my lens, although I don't do it that often.

I really need a fast lens - maybe 28-120 or something so I could just keep it on, but they are SOOOOO expensive. The ones I've seen are $1300+.
Anyone know why they are so expensive? Anyone found anything good for less?

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8/23/2005 10:09:54 AM


BetterPhoto Member Since: 10/28/2003
  Dust gets in there anyway. You hae to clean your sensor. Don't waste money on products. Go buy a good nylon artists brush. Spray compressed air on it, and wipe your sensor. So this seeral times, and your sensor will be clean. To check it, shoot something white at f22, and throw it OOF. All the spots should show up. Each time you clean, it should get better. You will NEVER get it 100% clean, so stop trying. Just get it close.

Luckily, I shoot mostly wide open, so I can't see even really bad dust particles.

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8/23/2005 10:33:30 PM

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