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Author Topic: Cleaning DSLR sensor
zesovietrussian
SuperBlabberMouth!
Member # 1177

Icon 1 posted November 17, 2005 20:00      Profile for zesovietrussian     Send New Private Message       Edit/Delete Post   Reply With Quote 
Looks like there's some dust stuck to the sensor on my digital rebel - anything shot at high aperture values has a rather annoying dark spot. At f8, it's huge (around 80 pixels in diameter) but barely noticeable - can only be seen against very light background as an area of slighly darker pixels. At f22 or higher, it gets quite a bit smaller (maybe 20 pixels or so,) but somewhat more in focus. What's the easiest way to remove those dust particles? Will a bulb blower do the trick?
Posts: 1094 | From: Boston | Registered: Mar 2002  |  IP: Logged
csk

Member # 1941

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Icon 1 posted November 17, 2005 20:35      Profile for csk     Send New Private Message       Edit/Delete Post   Reply With Quote 
You can try with a bulb blower, but it's a bit of a trick to get it right. The other main options are do it yourself sensor cleaning kits (make sure it's specifically for sensors), and getting it cleaned by Canon (which is free, apparently, but a pain in the neck, and you have to survive without your camera until it's done).

I haven't really done either (had a quick blow with the blower, but that's about it). Oh, and getting the mirror out of the way to get to the sensor might be tricky, unless you're using the custom firmware so you can do mirror lockup (standard DR doesn't have it).

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Posts: 4455 | From: Sydney, Australia | Registered: Jan 2003  |  IP: Logged
The Famous Druid

Gold Hearted SuperFan!
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Icon 1 posted November 17, 2005 20:36      Profile for The Famous Druid     Send New Private Message       Edit/Delete Post   Reply With Quote 
Doesn't sound like dust on the sensor, I can't think how that could show the symptoms you describe.

Dust or an oily mark on the lens could be your problem, or on the prism. (IIRC some DSLRs have a fixed 50% prism behind the lens, 1/2 goes to the viewfinder, 1/2 to the sensor)

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Posts: 10680 | From: Melbourne, Australia | Registered: Oct 2002  |  IP: Logged
Bibo
BlabberMouth, the Next Generation
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Icon 1 posted November 17, 2005 22:10      Profile for Bibo   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
Have you picked up an ear syringe (aka baby snot sucker outer) to clean the sensor? There is a page of "Cheap Tricks" for the Rebel here I have not tried any of the firmware hacks as I purchased an extended warranty and the hacks void the warranty.

I've had my 300D since June 2004 and have not had to clean the sensor yet, and I do change the lenses a bit but I do keep an ear syringe in my camera bag just in case.

Posts: 1641 | From: Grand Rapids, MI | Registered: Jan 2003  |  IP: Logged
Ugh, MightyClub
BlabberMouth, the Next Generation
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Icon 1 posted November 18, 2005 06:03      Profile for Ugh, MightyClub     Send New Private Message       Edit/Delete Post   Reply With Quote 
If the spot changes size/shape/focus depending on aperature, etc. then it can't be on the sensor itself. If it was on the sensor it would always look the same (and probably always look close to pure black).

That's my guess anyway, based on my understanding of optical physics.

Do you have a different lens so you can determine if the problem is somewhere in the lens apperatus or in the camera body itself?

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Ugh!

Posts: 1742 | From: Ithaca, NY | Registered: Dec 2004  |  IP: Logged
Tom- geeking around

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Icon 1 posted November 19, 2005 03:00      Profile for Tom- geeking around   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
I also believe that the dust/dirt particle is definitely not on the sensor itself, but somewhere else-
If it really would be on the sensor the spot would constantly look the same.

There might be something on the mirror, or on one of the lenses- even though I would tend to say, that it something is wrong with the lens -

If you bought the camera at a store that has a camera-specialist - or at a store that only sells cameras and accessories- you can go to the store again and explain the problem (maybe a few photo-printouts would help) - Even though most large super-stores do not.
They probably are able to do some "first aid"-action and clean it - or send it in to Canon, or whoever made your camera.

Be very careful with voiding your warranty - Cameras do need some work from time to time, and you definitely don't want a voided warranty.


Thomas

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Posts: 374 | From: Vienna | Registered: Aug 2004  |  IP: Logged
zesovietrussian
SuperBlabberMouth!
Member # 1177

Icon 1 posted November 24, 2005 17:32      Profile for zesovietrussian     Send New Private Message       Edit/Delete Post   Reply With Quote 
Turns out it was a dust particle stuck to the sensor, just as I originally suspected. I managed to remove it, and now all images are clean as a whistle. If any DSLR owner is looking for an (un)pleasant surprise, try shooting a white wall or a piece of paper at f22, you'll see what I'm talking about [Smile]
Posts: 1094 | From: Boston | Registered: Mar 2002  |  IP: Logged


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