I'd like to ask some advice on how to deal with a stubborn dust speck on my 5D sensor. I've tried a blower, Arctic Butterfly, Visible Dust's wet cleaning system, SensorKlear and a SpeckGrabber and this speck isn't moving This speck is in the upper left corner so it shows up on virtually every outdoor landscape shot...there's almost always blue sky there. Has anyone had a problem like this and how did you fix it? Oh, and don't say send it to Canon...this speck ended up there while Canon was "cleaning" the sensor, and they've tried twice now and haven't got it off.
Yeah, I know where it is I even bought a Sensor Loupe so I could see the sucker. I've gone through about 5-6 sensor swabs and need to get some more. I guess the wet method has the best chance of success. I have some Eclipse here as well, but hesitated using it since I heard there was some issue with it and the 5D.
My 5D is a bear to clean! It takes me at least an hour and 3-5 Copperhill PecPads and E2 solution ( used the normal solution with no problems at all but switched just for piece of mind) at minimum!!! Just keep trying and don't use too much pressure rubbing.
Dan
It is optically impossible for anything on the rear of your lens to image as a spot and show up in an exposure like sensor dust does. The surface of the rear element is totally out of focus, and things at that location just cause loss of contrast and loss of brightness. You likely had "lucky timing" that caused you to think it was your lens, but it could not have been.
I just cleaned the front and rear glass on the lenses I'm using, did get rid of a few specks, but there's a nice big one remaining that shows up on the exposure. No matter how careful you are changing lenses, the 5D sucks in dirt, and I really stink at cleaning it.
If you have a friend in Tokyo (or at a Canon Service center), the kit from Canon works well. I got mine from the Shinjuku Service Center, it cost about $50 if I remember well.
Also, be careful with Eclipse. For some reason, I had one bottle that messed completely things up and just added dust as I was trying to clean. Horrible story ...
Four more passes with Eclipse and no movement That kit from Canon looks interesting, it's like a full size version of the SpeckGrabber. Too bad it's not readily available.
This is almost enough to drive me to buy the 5DMkII
Roland W wrote:
It is optically impossible for anything on the rear of your lens to image as a spot and show up in an exposure like sensor dust does. The surface of the rear element is totally out of focus, and things at that location just cause loss of contrast and loss of brightness. You likely had "lucky timing" that caused you to think it was your lens, but it could not have been.
NO, I found the dust on the rear element, and it was unequivocally the cause the the problem. Try putting something on your rear lens before saying it is "impossible". I realized it when I tested f22 with different lenses, with the dust spot "coming and going".
It does not show up as sharp as dust does at f22. It showed as a blurry spot, like dust does at f11.
I use Arctic Butterfly 724. It seems to get rid of most dust. But I notice that the mirror and viewfinder also have dust. Now what am I to do .. spend more $$$..
madmax200 wrote:
Its in the opposite corner by the way.
Please explain what you call the opposite corner.
If the smudge is in the upper left corner when viewed on the image, on the sensor it is on the lower left corner if you could view the sensor from behind, which places it on the lower right corner when viewing the sensor from the front.
The lens inverts an image, but does not reverse it horizontally.
Imagemaster wrote:
Please explain what you call the opposite corner.
If the smudge is in the upper left corner when viewed on the image, on the sensor it is on the lower left corner if you could view the sensor from behind, which places it on the lower right corner when viewing the sensor from the front.
The lens inverts an image, but does not reverse it horizontally.
Imagemaster,
If the mark is in the upper left corner of the image, the speck is actually sitting in the lower left of the sensor as you look into the chamber. Forget about the sensor's position from the shooting position, it's just one vertical flip as you look head-on at the sensor. And a good wet cleaning system can be used on the mirror with no problem as long as you're gentle with the pressure.
This speck is in the upper left corner so it shows up on virtually every outdoor landscape shot...there's almost always blue sky there. Has anyone had a problem like this and how did you fix it? Oh, and don't say send it to Canon...this speck ended up there while Canon was "cleaning" the sensor, and they've tried twice now and haven't got it off.
I even bought a Sensor Loupe so I could see the sucker. I've gone through about 5-6 sensor swabs and need to get some more. I guess the wet method has the best chance of success. I have some Eclipse here as well, but hesitated using it since I heard there was some issue with it and the 5D.