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"Lubricants had to be chosen with utmost care because of the risk that conventional lubricants could boil off in vacuum and condense all over the optical surfac
by jacobush 8y ago
"Lubricants had to be chosen with utmost care because of the risk that conventional lubricants could boil off in vacuum and condense all over the optical surfaces of the lens."
http://www.mir.com.my/rb/photography/hardwares/moon/2.htm http://www.mir.com.my/rb/photography/hardwares/moon/2.htm