billnikon wrote:
Depends on the shape of your lens hood. If it is perfectly round, then yes, that's unusual. If not, maybe you had it on wrong, vertical instead of horizontal, some lens hoods are designed to fit only one way but it is easy to put them on wrong.
If it is tulip shaped for example, and you have the taller end to the sides instead of mounted top to bottom (in respect to the top and bottom of the camera) that would cause vignetting.
My Nikon tulip hoods won't lock into place oriented incorrectly.