This is not a normal setting on a T1i. A small circular image with black around it usually means something in the optical path is missing or blocking the viewfinder image.

Since it happens with more than one lens, the body/viewfinder is the more likely cause. One reported cause is a missing focusing screen/translucent screen above the mirror. That would affect what you see through the viewfinder.

To narrow it down:

• Remove the lens and look through the viewfinder. You should still see a full bright rectangular view (though not in focus). If the circular view remains, the problem is in the body/viewfinder.
• Check each lens from the front and make sure the aperture is wide open when the camera is on and idle. If a lens is stuck stopped down, or if internal parts came loose, it could also cause heavy vignetting.
• Take a test photo. If the photos look normal but the viewfinder looks circular, the issue is almost certainly in the viewfinder path, not the captured image.

Given your symptoms across multiple lenses, the camera body likely needs to be inspected again.