[wiseman]

Peter,
This is great info and I am trying to understand all of it.

So, using a shorter focal length lens such as a 35mm will require you to be closer to the subject than if you use a 50mm lens? The 31mm ltd would then be a bad choice for bellows use because I would have to be extreemly close to the subject?

A 50mm lens with the bellows set to 50mm will give 1:1, but extending the bellows to 100mm will give 2:1 magnification with the same lens?

When going from the 50mm bellows length to 100mm length (not changing the lens), does the focus distance change?

Thanks for your post and any help.