There are always trade offs with this screen size debate:
Lee Antin chooses to have a geometrically distorted image when watching 4:3 full width on his 16:9. He admits having this but has gotten used to it and is happy with his choice.
Others choose to have the silent CRT killer-- burn-in of a 16:9 or even 4:3 small image on the CRT larger targets. It is a silent "killer" because you don't notice the harm until you attempt to use the CRT's with a different screen size. Many times this does not become apparent until a new owner gets the projector.
With Masks and a full 4:3 screen I have decided in favor of the inconvenience of having to place the masks with each program but get perfect geometry and a balance of burn on my CRT's.
I do think that burn-in is not an issue if one truely restricts his viewing habits to the screen size forever. Burn-in is a problem if you watch one size for a long time and then decide to use another that the image now traces the old region plus a region of the CRT that was not used for a period of time.
This brings up a set of rules I was told early last year when I started searching for a used projector: Look for one that was used in a corporate board room. It will have typically less hours per year and be used in a non-smoking environment. Second, it will most likely have been used in a full 4:3 aspect ratio service burning the entire CRT target evenly. Buying a projector from another HT owner that was using a 16:9 screen will in all probabability have severe burn-in of a wide screen image onto the normal square CRT targets.
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