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1. Thoughts and Experiences
I've been playing with this projector for some time now and have come to a
few conclusions. First, this is a great projector for the price. Second,
electron beam focus is paramount to the quality of the image. And third, the
lower the video bandwidth that you put through the PJ, the better the picture
will be, relatively speaking.
1.1.
Scan Lines and Resolving Power
There has been some discussion about the maximum resolution that the
Sony 1270Q, or the entire 12xx series, can resolve. The resolving power of a
CRT PJ is controlled by a lot of factors, but the principal factor on the Sony
1270Q is the electron beam focus. The electron beam is focused by 2 sets of
magnets, a 2 pole set and 4 pole set. This isn't the most accurate way to
control the electron beam, higher end projectors use a combination of
magnets and Electromagnetic beam focusing, which allows for a much
smaller beam, allowing for much higher resolutions. This is the reason that
some PJ's with the same Sony 07MP tubes that the 1270Q uses can resolve
more scan lines.
The projector has a limited amount of phosphor in which to draw the image.
The number of lines which can be resolved is, in theory, the phosphor height
divided by the beam diameter. This number is the number of lines that the
projector can resolve without overlapping scan lines. Anything above this
number of scan lines will not be resolved and the picture will begin to appear
soft.
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