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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 17 Mar 2012 (Saturday) 20:47
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Are these dust on the sensor?

 
ariesadel
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Mar 17, 2012 20:47 |  #1

I took this picture with my Canon T3 today. There're some spots on the picture. Are these spots because of dust on the sensor? I changed the lenses a few times during the photo session though. Thanks.

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mike_311
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Mar 17, 2012 20:51 |  #2

take a picture at f22 or some crazy closed aperture of a plain white background. you should see any dust you have that that point.


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ariesadel
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Mar 17, 2012 20:54 |  #3

Yes, this picture was taken at f22.


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mike_311
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Mar 17, 2012 20:58 |  #4

then possibly. its doesn't look a hot or dead pixel,not with those "halos" around them. if you shoot an image at say f5.6 do you still see them? if not its probably dust.


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ariesadel
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Mar 17, 2012 21:09 |  #5

Thanks a lot for the answer. I captured a grey background picture at f5.6 and f1.8. The spots are still there at f5.6 but not as clear. At f1.8, its not there anymore. I think that it's probably dust. I will probably buy the cleaning kit from Amazon and try to clean the sensor myself. It's just annoying that this model doesn't have the automatic sensor cleaning function.


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Phototeacher
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Mar 17, 2012 21:48 as a reply to  @ ariesadel's post |  #6

It is a bit difficult to see in your posted photo, but the two spots at the left have a distinctive round shape, which almost looks more like oil spray droplets than dust.




  
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GregoryF
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Mar 17, 2012 22:14 |  #7

But yes it is a dirty sensor although I have seen much worse.


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ariesadel
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Mar 17, 2012 22:21 |  #8

Phototeacher wrote in post #14105073 (external link)
It is a bit difficult to see in your posted photo, but the two spots at the left have a distinctive round shape, which almost looks more like oil spray droplets than dust.

I cropped the spot positions in another picture for clearer views. The picture was taken at f22. I just bought the T3 brand new a few days ago and I only changed the lenses today. Do you know any reason that oil can get into the sensor? If it's there before I bought the camera, I probably would return and exchange for another one.

IMAGE: http://farm8.staticflickr.com/7047/6991689203_745a5fc146_z.jpg

IMAGE: http://farm8.staticflickr.com/7055/6991689223_7dd3914f27_z.jpg

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AMD72
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Mar 17, 2012 22:34 |  #9

I think it is something on the lens as the spots seem to be showing the edge of the aperture blades - i.e. not on the sensor but on the other side of the blades.

If it was dust on the sensor it would just be a dark blob - as these pixels would not receive light


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ejenner
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Mar 17, 2012 22:45 as a reply to  @ AMD72's post |  #10

The halo ones do look like something in the lens. The other one is definitely dust.

No equipment, lenses or bodies are dust-free from the manufacturer although usually a bit of something in the lens won't show up. If something did, it should be covered under warranty.

As for the camera - welcome to the world of digital. Don't shoot at f22 if you can help it.


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ariesadel
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Mar 17, 2012 22:50 |  #11

AMD72 wrote in post #14105260 (external link)
I think it is something on the lens as the spots seem to be showing the edge of the aperture blades - i.e. not on the sensor but on the other side of the blades.

If it was dust on the sensor it would just be a dark blob - as these pixels would not receive light

Thanks. I changed to a different lens and the spots are still at the same positions. So there must be dust or oil residues on the sensor.


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mike_d
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Mar 17, 2012 23:03 |  #12

left two = oil acting like lenses
right two = dust

Its not uncommon for a new camera to throw some lube around.




  
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ariesadel
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Mar 18, 2012 01:17 |  #13

mike_d wrote in post #14105365 (external link)
left two = oil acting like lenses
right two = dust

Its not uncommon for a new camera to throw some lube around.

Thanks. Do you think I should purchase a cleaning kit and do that myself or return the camera to Canon for warranty? Given that some spots were due to oil residues, will the cleaning fluid dissolve them? This is the kit I plan to buy from Amazon: http://www.amazon.com …?ie=UTF8&m=A35Z​38INQ6BCGI (external link)


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GregoryF
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Mar 18, 2012 01:31 |  #14

Yes that kit will work fine. It is pretty common even with brand new cameras to have dust/oil on the sensor. Heck it even is not unusual for them to come back from Canon service that way.


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mike_d
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Mar 18, 2012 02:19 |  #15

The dust spots should be removable with a rocket blower. That's always my first step before going wet. You may actually want to hold off on a wet cleaning for the oil spots. They're only going to be visible at small apertures anyway. Since your camera is new, it'll likely be throwing lube around for a little while and you'll just have to clean it again soon. 4 specs on the sensor aren't actually too bad and could easily be addressed in software.




  
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Are these dust on the sensor?
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