15 hours ago
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Re: Dust or dead pixel or sensor damage?
In reply to DerStig,
9 months ago
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Take it from me, this is the same for Nikon, Sony, Leica, Panasonic, and Canon. Unless you have a fixed lens camera, dust will get inside, eventually. So either clean it yourself or send it to Canon.
In your case, however, the oil that was used in production of your camera; albeit in the gears or springs must have not been properly and thoroughly removed. Over time, gravity or shutter firings will send these excess fluids onto the top of the sensor. Since they tend to be thicker and larger than common dust, they cast a spherical or oblong shaped shadow on your f22 to f36 images.
Now, let's say you don't want to clean or exchange for another camera, only to get different dust spots, you can shoot wide open all the time.
Let's say that's no good. You can make a dust delete file with your Canon and do post processing with your landscape photos.
Any which way, it's a work around. But honestly, there is no way to eliminate the eventual dust onto the sensor. This is one beauty of film that I truly miss, having a clean new frame after each shot.
DerStig wrote:
No I did not draw the circle around it:(! It has been there from the first shot I took with the camera. Its not as noticeable at F/22, but certainly one can see it after zooming. With F/32, as you can see, its clearly visible.
What do you mean by oil inside 5d3? Is it underneath the film cover of the sensor? Should I return it? Get it serviced in canon? Try rocket blower myself?
This is my second copy of this camera, first one had so many issues, including dust on sensor (this was not why I returned it), I am sick and tired of exchanging Canon gear.
chiumeister
wrote:
did you draw that circle around the dot in the middle?
if not, then it looks like oil splatter from inside the 5DM3. I had similar on my D800 and older 5DM2 a few years back.
It's hard to check for dead/bad/stuck pixels over the entire 22MP map. It is easier to check for dead ones in a 1080p video.
Simply set to a high ISO, say 10000, put your lens cap on any lens and record a short 1080p video. Change the ISO higher and lower during this process.
Your finish video should be completely black with no bright or white dots. If you get a few white or red or blue spots in the video, then those are dead/stuck/bad pixels.
hope this helps.
Paul
DerStig wrote:
These two images were taken from my 5d mark 3 with 70-200 2.8 II @ F/32. These dots have been there since the minute I opened up the 5d mark 3. They are more apparent at F/32 with the 70-200 than they are with the 24-105 kit lens or 35L at F/22 (that's the maximum these two lenses go). So these dots are on the sensor, not on the lenses. The question is, there is this one that looks really weird. It's on the second image, which is a crop of the original image, there is a circle with a dot in the center, would this be a dead pixel? Or damage on sensor? Or simply dust? I have tried doing sensor cleaning via the Menu, it made no difference.
Would this be grounds for returning the camera? I just fear what I will get in return will be much worse.
Also, this is just a general question, when there is sensor problems (dead pixel/damage), do they appear on every aperture, or only the small ones?
Thanks
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