[OM] Double exposure help

[Mickey Trageser]

Does anyone have any general exposure guidelines for double exposures? I hope 
to capture a flag illuminated against a night sky (top left, draping down) and 
overlaid with fireworks. I'm assuming a spot meter on the flag followed by the 
normal suggestions for fireworks with special attention to framing would work, 
but I welcome any opinions on the matter.

Thanks!
Mickey