>... the convention >used to define the Vidicon Tube. > >The convention used the diameter of the outside dimension of >the tube, but the actual sensing area was about 2/3rds the >size of the diameter of the glass envelope. So 2/3rds of an >inch is .66667 or 16.9mm. The diagonal of the sensor >referenced by the 1 inch designation in the referenced cameras >is about 15.86 mm which is close to the 16.9mm. > >Pete
Thanks for that, Pete. I once wondered enough about the strange fractions used to look up why; I never went any deeper into it as, to me, it was pretty much irrelevant.