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Author Message   photoman Rating: N/A Votes: 0 Posted on Wednesday, October 06, 2004 - 03:36 am:    Hello friends. I have problems with Vivitar Series 1 28-90mm F:2.8-3.5 zoom lens. It's Nikon F mount lens with AI. The apperture reacts slowly, I think it has to be oiled. What should I do? What should be disassembled to reach the apperture mechanism? It's 12 elements lens, I'm not sure that I'll be able to assemble it again without charts. The apperture itself somewhere in middle of lens, how could I get there? I'll be very happy and thankfull is somebody could help me with this.