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Eclair ACL 25fps speed problem
It's unlikely to be your crystal and I still suspect your motor. The
procedure you are using for measuring 24fps isn't nearly as precise as the
procedure you are using to measure 25fps so you can't compare your results.
How accurate is your measuring device for your projector? If it can only
measure to one tenth of a frame accuracy per second, that's not going to be
close enough to test for true precision.
The best option would be to have the frame rate for both 24 and 25 tested
with a crystal locked speed checker. All you need is a crystal locked bulb
that will flash at an exact 24 or 25fps. Mark a rotating part of your
suspect motor with a chinagraph pencil and illuminate it with the speed
checker. If it's precise you'll see a static fan tailed effect. If it's
out of sync the fan tail will seem to move back and forth.
That's what I was afraid of. But you know what, it's strange because I know
the 24 fps speed (using the corresponding crystal) to be right. (I have a
little electronic device conceived for measuring the speed of projectors
that counts the shutter openings in one second and shows that number divided
by two - because projectors usually have double shutters - and that gives me
a perfect 24/2=12. But I can't use that trick for 25 because it doesn't show
tenths of images). Could it be my 25 fps crystal that doesn't output the
right pulsation ? Then all I would need would be a new 25 fps crystal...
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