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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-cement-
by zorpner 6y ago
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-cement-to-recement-a-lens/ https://www.cloudynights.com/topic/661086-using-norland-uv-c...