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12/20/2004 05:14:58 AM · #1 |
Can anybody please advise.
I have just bought a Canon 20D and yesterday was its first outing. I noticed a blemish on one image and decided to do a test shot again with another lens. The blemish remained.
//server2.uploadit.org/files/caeclyd-testshotblue.jpg
The lenses were clean. I am going to buy a blower today (non aerosol type) and clean inside the mirror area. Any other advice please.
Message edited by ClubJuggle - Changed large image to link. |
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12/20/2004 05:38:02 AM · #2 |
Originally posted by Caeclyd:
Can anybody please advise.
I have just bought a Canon 20D and yesterday was its first outing. I noticed a blemish on one image and decided to do a test shot again with another lens. The blemish remained.
The lenses were clean. I am going to buy a blower today (non aerosol type) and clean inside the mirror area. Any other advice please. |
It´s dust. Nothing really you can do about it but try to blow it out or to try and swab the sensor. I myself have a thing that I use to blow out regularly but it doesn´t really bother me, at apertures bigger than f11 it doesn´t show at all and I rarely shoot apertures smaller than that anyway. If I do however it´s mostly macro shots at around f22-32 and then it´s usually something with lots of detail so the dust spots are not very obvious, and if they are I just remove the obvious ones in photoshop. On the other hand I did know about the "dust problem" beforehand of DSLR´s and made a decision to not let it bother me but you perhaps didn´t so I can understand your dissapointment. My advice is to get over it and go out and shoot some pictures, you probably won´t notice anyways...
Edit: Fixed an embarrasing spelling error.
Message edited by author 2004-12-20 05:40:14. |
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12/20/2004 06:27:14 AM · #3 |
Welcome to dSLR sensor dust. :-).
I had my 20D about two days before I saw my first dust spots in a couple of F/20 shots.
As larus has said, sensor dust will show at higher apeture numbers (smaller apeture..) I tend to shoot mostly F/8 and wider, F/16 occasionally, and the spots don't really show too much at those apetures in your average shot, appart from in the sky and they are easily edited out of the sky...
Check out the manual under 'Cleaning the Sensor' Page 36 of the manual... The fact that this is in the 'Getting Started' section of the manual will be a clue to how common the problem is.
The main times you pickup dust on the sensor is changing lenses, so if you're paranoid, don't change lenses.
For my part I shot 200+ photos at a 'Santa Parade' on Friday, and I probably changed lenses 10-15 times, and stuffed the lenses not in use into my jacket pockets. Lots of dust potential and didn't develop any more spots.
Old habits die hard, I was a chronic lens-swapper with my film gear, and unless I can find a 17-300mm F/2.8 lens that's as clear as my 50 F/1.8 I'll continue to swap lenses when I'm shooting events. Either that or I'll get rich and get another body.
Cheers, Chris H.
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12/20/2004 06:49:58 AM · #4 |
If you noticed dust from the first picture you took on buying it I'd take it back and demand a new one (unless you bought it second hand).
Whilst it's likely you'll get dust in it yourself after not too long it's not acceptable to get a new one with dust already on the sensor.
IMHO
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12/20/2004 07:09:10 AM · #5 |
Originally posted by Kavey:
If you noticed dust from the first picture you took on buying it I'd take it back and demand a new one (unless you bought it second hand).
Whilst it's likely you'll get dust in it yourself after not too long it's not acceptable to get a new one with dust already on the sensor.
IMHO |
It's not at all uncommon for a dSLR to ship from the factory with dust on the sensor. It's a quite normal occurrence.
-Terry
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12/20/2004 08:32:42 AM · #6 |
As others have already told you, it's probably just dust on the sensor. Blowing air into the camera is a bad idea in my opinion. It just makes the problem worse. This is the technique that I, and many others, use to remove dust:
CCD / CMOS Cleaning
You should also be aware that there's a slight chance that it's not dust. My 10D had several (12 or so) small doughnut shaped spots that would show up in all test photos, even after repeated cleanings. I sent the camera in to Canon and they replaced the sensor for free.
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12/20/2004 08:37:13 AM · #7 |
My 20D had an almost identical problem to the image posted. Still there despite a bit of blowing.
I kind of expect it really, given the exposure of the inner mechanisms to the clouds of dust all around us.
: (
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12/20/2004 12:26:04 PM · #8 |
I'd recommend the use of Sensor brush from Visibledust to clean your sensor. I was surprised at how easy it was to completely clean my sensor.
Check This Previous Thread
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12/20/2004 12:27:38 PM · #9 |
Return to Canon where they will clean it for free in 2 minuets
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12/20/2004 02:34:56 PM · #10 |
Thank you for all the advice...I should have stuck with the Fuji S602:-)
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