Canon 17-40mm Lens Photos Looks Flushed

[jahlavay]

I bought a used Canon EOS-1D Mark IV along with a Canon 17-40mm wide-angle zoom. When I use the lens, the picture is extremely flushed, too much light. But when I use the standard 50mm lens that also came with the camera the photos look good.

Is there a setting for the 17-40mm that I need to make?

[ebiggs1]

As you can clearly see something is amiss here.

It doesn't seem like you changed lenses. It shows you used the same lens, ef 17-40mm f4 for both photos. It also shows an ISO change.  I also suspect you had auto ISO turned on. When comparing lenses you must have every setting EXACTLY the same or it is meaningless.  The parking lot has the exit data stripped. We cannot help if you do that. 

I would guess you did not do a complete reset of the 1D4.

[jrhoffman75]

I don't see any strange camera settings that would affect exposure. What I do see is that you are in a sunny condition, so the "Sunny 16" guidance should apply.

You were in Program mode. In P mode the camera will select a shutter speed (generally 1.5 to 2 times focal length to avoid motion blur due to shake) and then try and get the lowest possible ISO f/stop combination, favoring a low ISO to avoid noise.

The ISO is 100. So the f/stop should be around f/16. I believe the aperture is stuck/sticking close to wide open.

Either take a photo in Av set to f/16 or just set the camera to f/16, press the DoF preview button and look into the lens. Is the aperture closing down?