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Try www.philbard.com.

I'm fairly new to large format myself, but have been reading everything I can along the way. I agree with almost everything posted but for the fact that you need an official 18% gray card.

Your...

I've got an old Calumet CC400 series 4x5 with the round monorail. It's got 4 inch boards and I've rented (from Calumet) a 240mm Caltar II in a Copal 3. No problems with mounting or movements....