Hi,
You probably do not have to open up the CRT lens to use it. The collar
ring can be slid up or down the length of the cylinder to adjust the
image; however it may be locked in place. You may need to gently rotate
the Collar to unlock it, in order to slide it up or down.
If your CRT lens does not seem to be adjustable, it may be because you
need to twist the collar to unlock it to allow adjustment.
Some of the modern LCD computer screens can be read with the standard
Optacon camera, so you may not need to use your CRT camera on them.
However, some of the modern computer screens can be read better with
either the CRT camera or the Calculator lens. It depends on whether or
not the display is actively lit or not. The calculator and CRT lenses
do not light the reading surface, and they also can help when the print
image is below a transparent cover plate, requiring the camera to focus
below the first surface on which the camera rests.
The standard Optacon camera lights up and also focuses on the print on
the surface on which the camera rests.
The magnifier lens also might work on a modern LCD display, keeping in
mind that, like the standard Optacon lens, it supplies the light and
focuses only on the first surface.
Cordially,
Noel
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