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FLEX Seamless Follow Focus Gears by Proactive Group
  • Seems precise made and inexpencive (US $9.90 on ebay) compare to other rings. http://proactivegr.com/gears/

    The gears are designed for ANY LENS diameter from 50 to 93mm!

    Separate gear made for each diameter of 1 mm increments!

    The gears are made of rigid polyurethane, that stretches a little bit, when you put the gear on.

    The correct form of the teeth module 0.8.