I have to concur here - I straightened a (severely bent) filter ring
on my
24/2.0 after bumping it very hard, and I had at the time never before
taken
a lens apart.
The method below is easy and really works, just be gentle and patient.
If you
over-correct, you're buggered. (You'll almost never get it in perfect
again, as
the metal seems to start to 'stretch')
On 14 Aug 2009, at 4:28 PM, Chuck Norcutt wrote:
> 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
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