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Common wisdom is that guiding through a reflector is not a good idea because of mirror flop/shift. However, I suspect this is a hangover from the days of film when exposures went for an hour or more. The last thing that you would want would be for the image to shift slightly and spoil the exposure. These days, with shorter subs and stacking, it shouldn't be an issue--who cares if you have to discard one of the subs.
Geoff
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