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Brent is spot on; I have worked with numerous external intervalometers, [as opposed to camera built in ones], and all display some inaccuracy. As most
AP exposures are at least 15 secs, and usually longer, the inaccuracy is
unimportant[as already stated by Brent]. The main thing to remember to
do when using the in camera noise reduction feature, is to make the interval
at least 30 secs to give some sensor cooling time.
raymo
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