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Nikon MD-3 Instruction Manual page 14

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FRAME COUNTER
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The frame counter on the motor drive shows the number
of u n e xp os e d fr am e s r em ai ni ng o n a rol l of fi lm. lt i s
calibrated in even numbers from 0 to 40. The frame
counter preset wheel can be rotated in either direction.
When the counter reaches zero, the motor will stop auto-
matically. lf you want a certain number of frames to be
set for continuous firing, just set the counter to the de-
sired number. This operation can be done repeatedly.
The frame counter on the camera also continues to oper-
ate when the motor drive is attached, so you can easily
see how many exposures you have left.
o Be careful to set the number of frames correctly. lf
y ou ov er es ti mat e t he num ber r ema i ni ng o n a r ol l of
f i l m , t he r es ul t may be t hat th e m ot or w i l l pul l t he
film off the supply spool or damage its perforated
edges, since the motor will continue to operate until
the counter reaches zero.
o Turning the frame counter's preset wheel away from
its zero position when the motor drive is removed from
the camera may occasionally result in the motor drive
running freely until the counter resets itself to zero.
This is a normal operating condition, caused by the
end of the film being reached before the motor drive
completes its advance cycle, and is no case for concern.
When the motor drive is reattached to thecamera, this
condition will be corrected automatically.
o The motor will not operate when the counter is at
zero. Always check the counter before starting to
s hoot , es pec i al l y at t he b egi nn i ng of a r ol l .
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