Hi,

Francis Tang wrote:

(snicker)
..two 6X7s and an KX mounted on a wooden bracket..two LXen with
winders (or
maybe they were actually motordrives) mounted side-by-side on a
monopod..
(snack)

This is a common technique when imaging [8-)] trains.  The
"base" photograph is a landscape, with the variable of the train
inserted fleetingly.  Multiple apparatus can give the option of
at least different format or film or both for the one attempt. 
You can also alter shutter speed and/or aperture.  I've often
wondered if the technique has applications elsewhere.  Obvious
areas are things like firework displays or rocket launches. 
Maybe it would be useful for aurora photography.

mike
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