Distance is measured from the lenses aperture blades (not shutter even though it's almost the same) to ground glass when bellows are racked all the way back.
Originally Posted by renes
I asked you this to know if your camera can focus 65mm lens to infinity. You need bellows draw equal to focal length for focusing any lens to infinity, in other words 100mm of bellows extension focuses 100mm lens to infinity. 2x focal length of bellows draw focuses any lens for 1:1 macro shots.
I'm slightly worried that a 65mm lens would get bed of your camera into to the picture.
'Any lens' doesn't include telephoto designs, that's a different story.