Help with disassembly of a Nikkor 200mm F8 lens

[cme37]

Hi there,

need help to disassemble the front element since there is some lens fungus in between the 2 glasses of the front element. Does anyone know how you actually take apart the front element? I have done that before with older lenses but I am not sure how to do it with the Nikkor 200mm F8 lens.

Any help is much appreciated, thank you!
Christian

[Ted R]

I haven't worked on that particular lens but the general arrangement is a dress ring that is slightly conical this is removed using a rubber bung (from home brew supply) and hand pressure. Below the dress ring will be the lens retaining ring with the usual spanner slots.