Sensor mark

A friend sent me two pictures from work today with a sensor mark on a lot of the shots. In the first shot it is to the right of the riders head and is fairly easy to spot in the second shot. Looks a funny one and I have never seen one like it. Any ideas if it is anything more serious? Canon 1dmk3 and happens on all lenses.

From looking at it myself it looks like sensor dust

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it looks like dust to me. have you tried blowing it out?

It looks like a spot of grease. I had a spot like that on my 1DsII sensor, and at first, I tried to blow it away, then brush it off with the SensorKlean from lenspen...which promptly smeared it all over the sensor (thought I scratched it!) Two passes with Eclipse E2 and a sensor swab and it was completely gone, though. No damage, clean as a whistle.

Try a blower and then go out and buy an Artic Butterfly.

Sweet bit of kit!

It looks like big cluster of stuck/hot pixels to me. IMO that sensor needs replacing which is quite expensive repair if camera is out of warranty.

Looks like dust to me. Or as others mentioned lubricant with dust.
I had the exact same thing happen to me while on vacation and stopped down the lens. Never noticed it before since most all shots were wide open.

Copperhill method is what I used.

It did take several passes to get it removed.

Before Cleaning

Sometimes lubricants from the camera get thrown on the sensor when the mirror flaps up and down or too heavy blowing with a bulb blower, in which case don't use a sensor brush on it as it will smear around on the sensor and contaminate the brush too. You will probably need to wet clean with Eclipse or Visible Dust Smear Away. There is also a possibility that is spit, if somebody was looking in there in cleaning mode trying to orally puff dust off or while talking.

There are also some big fibers on the sensor which should blow away.

As what's been said. If it's grease don't brush it out with the Butterfly.

Grab a flashlight (I've found LED works best) and see if it helps light up the dust or grease marks. You should have a better indication of how to attack it once you've sighted the foreign material.

If it's grease, use a Copperhill kit. If it's dry then blow it out first before trying the Butterfly.

And do not forget what you see on he picture is reverse on the sensor, so what is up on the picture is down on the sensor.

It's definitely an oil mark. As previously stated, the sensor will have to be wet-cleaned before using a brush or pen.

Best,
Nicholas
www.copperhilimages.co​m/index.php?pr=galleri​es

Thanks everybody, I will pass on the info. much appreciated

Yes, their is dust that is easy to clear, but their is more!!!!!!!!!!

Dust aside, good picture.