Typically the size of the packard is really close to double the size hole. ie. a 5" Packard will have a 2 3/4" opening. etc.
Thanks, Jim. I've been watching auctions lately, but the prices are a little crazy these days. A friend of mine who has a camera shop has a Packard whose outside measurement is just over 6", which I could have for a song, but unfortunately it won't fit any of my cameras. (Is there any way to adapt/trim a Packard to fit a smaller board? The absolute maximum my camera could handle is 5 1/2".)
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...