Sensor booger or??

[inkjunkie]

Have a 1DX Mark III. Absolutely in love with it. Spent Friday & Saturday evenings at the local motocross track. Needless to say gear is filthy. Need to take the bag the camera/lens is in out to the garage and use the shop vac to get all the silt off of it before opening the bag and cleaning the camera/lens. Prior to mounting the lens I did a test shot on a white piece of paper to verify the sensor was clean...it was. Started culling the images and saw a repetitive mark.....

Have seen plenty of boogers in my short time of photography but none that look like what I circled. Is that an oil smudge on the rear element of the lens? The lens I used was a 300 f/2.8 L. Last time I used the lens I had swapped the Circular Polarizer into it. It is very possible that I may have put a grubby finger or three on the clear one while swapping it into the lens.

[jrhoffman75]

In my experience it is more likely something on the sensor than a fingerprint on the front of the lens.

I'm curious why the image looks like it does.

[ebiggs1]

"I'm curious why the image looks like it does."

Color negative of a motorcycle rider with a pole going through him!

[xdm92013]

Looks like a dust bunny AKA sensor dust

[jrhoffman75]

How does one get a color negative from a 1D X Mark III. I am not familiar with how to do that.

[ebiggs1]

"How does one get a color negative from a 1D X Mark III. I am not familiar with how to do that."

Photoshop!    It doesn't care what DSLR you have, it will make a color negative and it can remove the pole from the rider, too.

[Waddizzle]

The vertical bar appears to a pole that is BEHIND the rider.

[jrhoffman75]

Thanks. I don’t use Photoshop and aren’t familiar with all its capabilities.