Repairing aperture linkage in Nikon AI telephoto lens with Internal focusing.

[John Crowe]

I have repaired the linkages and springs in Canon FD mount lenses

and assumed that doing so with a Nikon AI lens would not be that

much more difficult a task. My Nikon AI telephoto lens, with

internal focusing, was unable to open to the maximum aperture, so I

thought it would be straight forward to repair the aperture

mechanism completely or at least fix it in the open position. I

have no intent to use it other than wide open. I removed the mount

itself and the ring with the aperture markings. I have removed the

screws around the barrel of the rear section of the lens but the

rear inner barrel will still not come out to provide access to the

aperture control mechanism.

 

What am I missing?

 

I would appreciate any help possible and I have some digital images

of the lens I could post if necessary. I have tackled this myself

simply because I have done it with Canon FD lenses before and it is

usually a one hour task.

 

Thank-you.