Check out this web site
http://www.kenrockwell.com/tech/filmdig.htm
Yes indeed, it is a good site.
One thing the author said twice that seemed odd to me was about "One
cannot make double or multiple exposures with digital cameras. "
Sure, this is more or less true for current DSLRs but it's a dumb
thing to throw at digital. After all, "why" would anyone want to make
double exposures on digital? Surely the result would be
indistinguishable from combining HDR versions of the two digital files
later??? And, of course, the photographer gets to control the balance
of the two frames at the finishing stage
With film double exposures were
1) quirky
2) semi random
Due to film characteristics the result might not be the same as
attempting to combine two frames later but ...
Bob