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  • Users: RFrazier
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  1. RFrazier

    Specification for Focus Adjustment, binds and squeaks

    Working with a Specification on a new lens design. I am trying to find some industry specification that addresses the design requirement and/or tolerance of focus adjustment. Example #1: Manual focus of 50mm lens, shall require no more than XX in-oz of torque to operate focus ring and no...

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