Re: Rmoving oil inside objective


"jon" <jon.goguen@xxxxxxxxxxxx> wrote in message
news:1117209098.770795.211240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Does anyone know of methods for removing immersion oil from inside an
> objective? I have a high quality Nikon PlanApo 60/1.4 that has
> accumulated internal oil after years of use on an inverted scope.
> After determining the cost and schedule of repair by Nikon, we opted to
> replace the original objective with a used one. I still have the
> contaminated objective, and would like to try cleaning it in-house if
> there's a reasonable approach. It seems to me that if oil can get in,
> so can a much lower vicosity solvent. I'm considering cycling solvent
> in and out by the alternate appilaction of positive and negative
> pressure, followed by drying in a warm oven. Does this seem
> reasonable? Ant other Ideas? I haven't seriously considered
> disassembly, since I have know idea how to do it and I'm afraid
> accurate reassembly would be extremely dificult.
>
> Thanks!
>
> Jon
>

Your idea probably won't work. You have to carefully dissasemble the
objective and put each lens element in order. Then clean off the objective
and carefully reassemble the objective.

There's not a thing simple about this process, there are 16-18 elements in
that plan apo. Its simple to write about but you have to be ever so
carefull. Since you're an amatuer ...you just have to be carefull. Oh and
have the right tools. Some of them you'll have to make.

Kevin Cunningham
SMS


.

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