I have a rodenstock 180mm apo macro lens for up to 2:1 reproduction range. How do i calculate how much bellows extension i need to get 2:1 magnification? i tried used an ebony non folding 4x5 but can seem to get enough bellows extension for 2:1 magnification so i thought i'd get a monorail 4x5 for studion use.
thanks
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