Re: 16:9 to 4:3 Converter?
To do it optically you need an anamorphic lens in front of the projectors lens. Cinemas once had to use them for CinemaScope 35mm films and others which had a horizontally squeezed image. I have an ex-cinema one in my collection. It is a Varamorth and you can adjust the amount of stretch.
Nowadays with digital replacing film the stretch can be done electronically or optically.
You can still buy anamorphic lenses but they are not cheap.
John
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