Re: OT - Why preflash? (was:Re: DSLR slide duplicator)

[Andre Langevin]

Thanks for the nice theory behind the applications.

Now, in practical terms, for non-professional work, if I use KR (64 
asa) to copy slides, should I expose all my film at 6400 asa (100:1 
ratio), go back to take 1 (easy with a LX) and take my slides 
normally at 64 asa?

Andre