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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 25 Oct 2011 (Tuesday) 13:47
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What is wrong with my 50d...help please!

 
karobinson
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Oct 25, 2011 13:47 |  #1

I was involved in a lets just say water spray while changing a lens during a shoot. I then noticed round "dots" on photos with increased ISO. I took the camera in to a local Canon service shop and they cleaned the camera. I still get these dang spots. Help!!!!!!!!!!!!!!!


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embassy
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Oct 25, 2011 13:58 |  #2

sensor needs cleaning




  
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number ­ six
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Oct 25, 2011 14:04 |  #3

Doesn't look like a dirty sensor to me. Spots on the sensor are darker, not lighter.

I'm thinking flare. The direct flash here is very harsh. Can you show us a shot that has soft lighting?

-js


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karobinson
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Oct 25, 2011 14:17 |  #4

This one shows it a lot better. And it only shows up when I use ISO of 400 or higher...gets worse the higher I go with ISO. Other photos shot at the same time with lower ISO does not have these spots.....thanks for trying to help me here....would just like to have more information when I take it in to have it cleaned it gets done properly.


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Ann Robinson:)
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gofer
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Oct 25, 2011 14:22 as a reply to  @ karobinson's post |  #5

Have to agree with number-six - that's not the result of a dirty sensor. Looks much more like flare. Did you get water splashes on either the front or rear element of your lens?


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number ­ six
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Oct 25, 2011 14:23 |  #6

Wow. That's pretty nasty, isn't it?

As I mentioned earlier, junk on the sensor shows up as dark spots, not light ones.

So I suggested flare, but I don't see any light source that would account for so many spots.

If you get this effect with all your lenses, it's obviously in the body. But I can't think where it might be. Flare occurs in the lens, not the body. Usually.

All I can suggest is you show them this second shot when you ask them to clean the camera.

Let us know what transpires, please. Interesting problem.

-js


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karobinson
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Oct 25, 2011 14:29 |  #7

Thanks .... will do.........


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Veemac
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Oct 25, 2011 14:46 as a reply to  @ karobinson's post |  #8

Since the spots don't seem to be in the same places in the two photos shown, I'm wondering if it's the flash illuminating airborne dust particles.


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TGrundvig
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Oct 25, 2011 14:49 |  #9

Is this with all lenses, or just one lens?


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JohnB57
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Oct 25, 2011 14:49 |  #10

Water droplets wouldn't dry quite like "junk" on the sensor. Clean the sensor and at least eliminate that as a cause.




  
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embassy
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Oct 25, 2011 14:51 |  #11

can you take a plain picture without flash and see if its still there , have you tried any other lens ?




  
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killeraxemannic
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Oct 25, 2011 14:55 |  #12

Have you put the camera into manual cleaning mode and just looked at the sensor to see if you can see anything?

Is there a chance that whoever cleaned it just ripped you off and did not clean it?


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led ­ hed
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Oct 25, 2011 15:11 |  #13

the higher and lower spots seem to be oblong and not circular, so what does that tell me? not much really, just that maybe whatever these are, they reside on a convex or concave surface.

hope you get it cleared up.


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JohnB57
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Oct 25, 2011 15:40 |  #14

Ann. This is very fine mineral residue left when the water droplets have dried on the sensor. If you look at the double droplet, just left of centre bottom on the kitchen shot, the mark appears, albeit less clearly, on the other shot. Other marks also appear in the same positions, more or less distinctly. It may be that in camera processing has made it more apparent on high ISO but either take it back to the tech for a second attempt at cleaning the sensor or do it yourself for twenty dollars or so. I use Visible Dust swabs.

Edit... high ISO may also mean smaller aperture. Which means any spots on the sensor will be more distinct (because the spots are actually on the anti-alias filter, which is slightly in front of the sensor).




  
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karobinson
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Oct 25, 2011 15:58 |  #15

OK....figured it out............it was the flash......
Yes to all lens...this is why I assumed camera issue....
Flash off no issues.........no matter how high the ISO was....
Flash on.........oh there is my issue..........

Thank you everybody....this is why I suggest anyone who touches a camera should be a member of this forum..........you all rock...............


Ann Robinson:)
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What is wrong with my 50d...help please!
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