Originally Posted by
Peterpan1
What I don't like about the mirrors is the differential focal length.
All of the helmet- or glasses-mounted mirrors I've seen are flat, in which case I believe there is no focal length involved. And a very small rotation of the head results in a quite wide field of undistorted vision. While CCTV might be a more elegant solution it's also pretty "far-out" from an economic standpoint!
Regards,
Bob P.