5D2 sensor defect

[gmoneyguy]

Here is a 100% crop of a photo shot at f/32. I was checking my sensor for dust and found this strange mark. I took it to the camera shop that I use to clean my sensors, and they put the camera under their microscope. They said there was a defect in the glass covering the sensor, similar to a chip in a windshield. The more I stop down the sharper the circle gets. I'll probably never shoot at f/32, but it is still very visible at larger apertures.

Have other people seen this? Is this a common sensor defect?

 

[chunin]

It looks like dust so it might just be dust.

Here is a 100% crop of a photo shot at f/32. I was checking my
sensor for dust and found this strange mark. I took it to the camera
shop that I use to clean my sensors, and they put the camera under
their microscope. They said there was a defect in the glass covering
the sensor, similar to a chip in a windshield. The more I stop down
the sharper the circle gets. I'll probably never shoot at f/32, but
it is still very visible at larger apertures.

Have other people seen this? Is this a common sensor defect?

 

[Ross Murphy]

Looks like 3 dust specs and one drop of shutter oil, your sensor is fine
--
Image's In Light North West
http://rossmurphy.zenfolio.com/

 

[gmoneyguy]

It's too perfect to be a piece of dust. They tried to clean it under the microscope, but it could not come off. In fact, when the light hit it at a certain angle it got very bright, just like a chip in the glass.

Just wondering if other people have seen this. I've never heard of it.

 

[Ken Phillips]

... a flaw in the coating on that side of the glass. But it DOES look just like an oil spot. If so, return your camera or send it to Canon for a fix.
KP

--



http://www.ahomls.com/photo.htm
http://www.phillipsphotographer.com
Voted Best of the City 2004 by Cincinnati Magazine
I don't believe in fate, but I do believe in f/8!

'The urge to save humanity is always a false front for the urge to rule it.', H. L. Mencken

 

[upgrader]

It looks like an UFO

 

[Smorter]

Maybe a water or oil droplet under the first layer or a air bubble or something in the fluorine coating, I'd say return or send it in.

 

[DA_Service]

The 5Dm2 low pass filter actually has two coatings on it. On the exposed side it has the fluorine coating that acts much like a Teflon coating on a frying pan. It also has a dichroic mirror coating on the backside of filter, facing the CMOS chip. If it's refracting the light then that might be pointing to a flaw in the dichroic mirror or contamination on the backside of the low pass filter.

We have asked Canon how the fluorine coating was applied but they are keeping that information proprietary. Fluorine coatings can be applied using ion sputtering, evaporation and gassing. If they used gassing or ion sputtering then there is little to no way of this happening. If they used evaporation fluorine coating then we feel that it could happen, but very unlikely.

We suggest sending it in to have it reviewed by Canon.

The Dust-Aid Team

 

[clarksbrother]

I agree on what it looks like but I'd still send it to Canon if a cleaning doesnt fix the issue.

Looks like 3 dust specs and one drop of shutter oil, your sensor is fine
--
Image's In Light North West
http://rossmurphy.zenfolio.com/