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Message: <blockquote data-quote="BruceH" data-source="post: 3331439" data-attributes="member: 106398">Before Jerry's comments get lost in the abyss of the Forum, here is a link to his informative post.  <a href="http://www.birdforum.net/showpost.php?p=3316264&postcount=45" target="_blank">http://www.birdforum.net/showpost.php?p=3316264&postcount=45</a>Jerry's references the eye cup material of the SF as plastic, but I would use the term composite.  That is my personal preference over metal because if dropped on the eye cup, the composite material is likely to to just fracture and can easily be replaced with a call to Zeiss.  A drop on a metal eye cup is more likely to damage the threads in the eye piece housing, thus requiring a more extensive repair by the manufacturer.  The softer thread material of the composite eye cup sacrifies the inexpensive and easily replaced eye cup but saves the housing.</blockquote>