Straightening the filter ring isn't really difficult. But it does take
patience. See page 46 of Book 1 of Thomas Tomosey's Camera Maintenance
& Repair.
<http://books.google.com/books?id=FG4Kas5kO5wC&pg=PA46&lpg=PA46&dq=how+to+straighten+a+filter+ring&source=bl&ots=l68DR4JWK5&sig=TavzhWH_mPbpPC3LugB7bwTugHk&hl=en&ei=SW-FSoLUCouXlAesqPCCBQ&sa=X&oi=book_result&ct=result&resnum=2#v=onepage&q=&f=false>
When I did it myself I cut a piece of wood to the outside diameter of
the lens barrel and then used a 9-12mm diameter piece of hardwood dowel
with a lightweight hammer to knock it back into shape. I didn't have
the patience to get it perfect but it was good enough to screw a filter
in with a little bit of thread friction. I'm sure I could have removed
the name ring if necessary. The worst part is finding some way to hold
the lens steady if you don't have a cooperative assistant. (I didn't)
I think I'd be willing to disassemble the lens but you need to know
about the caveats of working with helical threads before doing that.
Note the comments on helical threads jumping a thread as the result of
impact damage. Was this lens ever able to focus properly after the
impact that bent the filter threads? If not that may be the problem.
Chuck Norcutt
Carlos J. Santisteban wrote:
> Hi John and all,
>
> From: John Hermanson <omtech1@xxxxxxxxxxx>
>
>> Focus ring comes off from the front. You'll have to straigten the
>
>> filter ring to be able to get the name ring off. Focus ring doesn't
>
>> budge a millimeter? Could be a spec of sand in the focus threads very
>
>> hard to tell, but taking lens apart could get you in much more trouble.
>
>
> The ring does move a little bit, but it always had some play in it.
>
>
> OMG... this is starting to look FUBAR :-(
>
>
> Cheers, and thank you very much,
--
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