24-03-2021, 10:43 AM
(This post was last modified: 24-03-2021, 10:55 AM by peter scott.)
Hello Jac,
I thought you might be interested. I'm not sure to what extent the image on the CRT is keystoned. I did wonder if it wasn't a very efficient use of the 4" screen. The angle of the optics to the flat mirror would suggest quite extreme keystoning. It was the BBC reaction to its performance that I thought was really interesting. The 60 degree horizontal viewing angle sounds a bit restrictive but they don't raise a major objection to that.
I have no doubt that you are aware of the BBC report on their visit to Philips in 1946 with very interesting comparisons of the Philips (RCA) Iconoscope to the Emitron and thoughts of replacing Emitrons in BBC cameras.
Peter
p.s. That's a super picture of your 567 line test card image.
I thought you might be interested. I'm not sure to what extent the image on the CRT is keystoned. I did wonder if it wasn't a very efficient use of the 4" screen. The angle of the optics to the flat mirror would suggest quite extreme keystoning. It was the BBC reaction to its performance that I thought was really interesting. The 60 degree horizontal viewing angle sounds a bit restrictive but they don't raise a major objection to that.
I have no doubt that you are aware of the BBC report on their visit to Philips in 1946 with very interesting comparisons of the Philips (RCA) Iconoscope to the Emitron and thoughts of replacing Emitrons in BBC cameras.
Peter
p.s. That's a super picture of your 567 line test card image.
