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To order: 10-14 days The PRORING enables two PRO50 tubes to be connected together with a BALPRO or BALPRO T/S bellows unit to give greater extension.
Two PRO50 tubes thus connected in conjunction with the PRO APO-DIGI 90mm lens and camera adaptor give a fixed 1:1 magnification.
The connection is strong enough to allow even more tubes to be coupled if required.