Dark arch shadow on images

[melmadden23]

Hi! I'm trying to trouble shoot a problem I'm having with my camera.  There is a dark shadow-looking arch that is showing up on almost all of my images.  I'm having this problem with multiple lenses so I know it's a camera issue and not a lens one.  Has anyone seen this before?  Any ideas as to what is causing this?  Thanks for your help!

[ebiggs1]

It looks more like a hair.  Whether dust or hair, I would take it to a local camera shop and have them clean the sensor.

You can try a Rocket blower if you want.  They are nice to have anyway.