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Re:Nikon Issues Small Recall for a 16-Year-Old Film Camera by wishinghand on Thursday July 16, 2020 @07:20PM (#23865011)
Cement? As in some sort of plastic cement?
Re:Nikon Issues Small Recall for a 16-Year-Old Film Camera by mauvehaus on Thursday July 16, 2020 @08:05PM (#23865375)
Optical cement. Traditionally, Canadian Balsam would have been used, but there are newer adhesives that are apparently easier. I bet UV cured is a lot more practical in a production setting. See this article about using balsam to repair a doublet:

http://forum.mflenses.com/re-cementing-doublet-elements-with...

Re:Nikon Issues Small Recall for a 16-Year-Old Film Camera by zorpner on Thursday July 16, 2020 @07:47PM (#23865221)
Most likely one or another optical cement, for joining lenses into a lens group, for example: https://www.cloudynights.com/topic/661086-using-norland-uv-c...