Female connection tube for BALPRO-adapters


-allows the connection of two extension tubes PRO50 or other BALPRO connection adapters

-The combination of PRORING, 2 tubes PRO50, the PRO-APO-DIGI 90 and the matching camera connection adapter gives a fixed magnification of 1:1

-Thanks to the modularity of the system, even longer and incredibly robust macrotubes can be mounted


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