Exotic 5D-MK2 image artifact - URGENT assistance haha.

it looks like there's a hair or some cloth fiber on your sensor

the bad news is that cleaning a sensor is risky and not for the faint-hearted
the good news is that a hair or cloth fiber is one of the easier things to get rid of

so, watch this:
http://www.lensrentals.com/blog/2010/04/how-to-clean-a-camera-sensor
and get only as far as you need in order to get clean images again (the blowing bit is not risky, so if it works just avoid all the rest)

if you want to feel more secure about what you're doing, you can also read this:
http://www.lensrentals.com/blog/2011/05/the-lensrentals-lens-cleaning-methods
 
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