On my Canon 6D, other lenses work as expected. But my 50mm f1.4 which has been very reliable for many years seems to have problem focusing. It can sometimes focus when the subject is close (1-5' away). But if I were to take a photo of my front yard or anything further away, the lens can't focus. I hear the motor trying to focus but the subject is fuzzy. The focus light blinks green.

To make sure I don't have a incorrect setting, I've been using Auto mode, the lens is set to AF and I've been testing outside in bright light.

Does the lens needs to be repaired or did I screw up a setting on the camera?

On my Canon 6D, other lenses work as expected. But my 50mm f1.4 which has been very reliable for many years is not focusing correctly. It can sometimes focus when the subject is close (1-5' away). But if I were to take a photo of my front yard or subjects > 6' away, the lens can't focus. I hear the motor trying to focus but the subject is fuzzy. The focus light blinks green.

To make sure I don't have incorrect settings, I've been using Auto mode, the lens is set to AF and I've been testing outside in bright light.

Does the lens needs to be repaired or did I screw up a setting on the camera?