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JMI - RCF Drawtube UpgradesThe Reverse Crayford Focuser (RCF) is a light-weight, low-profile focuser with a new revolutionary design - JMI′s low-cost,
high-quality answer to plastic focusers. The reverse Crayford design gives zero image shift and zero backlash. (U.S. Patent No.
6,297,917)
RCF focusers come standard with a 3″ length drawtube. The following part number is for upgrading the drawtube length to
4.6″ at the time of purchase of an RCF focuser.
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