Hi,

When I purchased a Mamiya 654 Pro last year, three extension tubes were included. They're marked (from shortest to longest): No. 1, No. 2, and No. 3-S. I am not familiar with the use of extension tubes, but am interested in using them to allow closer focusing with some of my lenses (80mm 1.9, 110mm, and 150mm).

Is each lens ideally matched with one particular extension tube? Will the longer extension tubes allow closer focusing than the shorter ones? Are certain tubes incompatible with certain lenses?

Thanks for any help with this.

Dale