John Carrier wrote:
Done on the Phantom in some squadrons. Lined up with boresight. With radar
lock and bogey on the nose, you'd lean forward and get a magnified view and
hopefully an early VID. Somewhat awkward to use.

Going back in time, Galland had a similar sight set up in his BoB-era
Bf 109 E. It didn't work in practice so he went back to the old
fashioned Revi.

v/r
Gordon
PS, nice to see you JC