The correct exposure to give the film is the key to first class 
results. One of the best possible systems is to find a number of
settings which give the required result - possibly by a series of
tests - then noting these down and ALWAYS using them with the
camera metering system set to manual.

This approach has the advantage of allowing for images with light
backgrounds, or dark backgrounds, both of which can
adversely influence an exposure system.

Once the monitor/TV is set up, the correct exposure is that that
will use the light supplied by the screen ONLY to achieve a good
result. 

A FLASH GUN IS NOT USED !

Drawing the curtains, or working in a dark environment will also
improve the results at time of exposure by preventing outside
light from falling on the screen and affecting contrast.


The problem is that a TV scans to produce an image, and builds up
half an image in 1/50 th. second, and the other half in the next
1/50 th. second. Thus, an exposure of 1/25 th. second is the FASTEST 
that can be used in order to record a full image. Faster exposures 
record part images, and probably lines diagonally across the screen.

A shutter speed of 1/15 th. second or slower is a better bet -
hence the tripod and cable release/delayed action requirement. As
the image is still, slow shutter speeds are not a problem.

If working on automatic, the best bet is to set the shutter speed
at, say 1/15 th. second in `shutter priority` mode, and let the
automatics choose the correct aperture.

As some zoom lenses have poor maximum apertures - f4 or f5.6 -
even slower shutter speeds may be needed. At least, the image is
reasonably flat, and thus little depth of field is needed.

In general photography, a large depth of field may be needed, and
this is achieved by using small apertures. Here the requirement
for small apertures is not great.

I repeat.... 

The best way to achieve high quality results is to set up and
shoot a series of pictures of the SAME screen at different
settings. Carefully record all details of each shot. When the
pictures are processed, at least one will, hopefully, be spot on.
That gives a standard setting for all future efforts as long as
no factors change.