Here's the page -
http://www.kyphoto.com/classics/filterringtool.html
I've had great success too with this method on many lenses. I prefer a
piece of 3/4" wide, thin flat strap as a punch - one cut to the inner
profile of the filter ring for finishing and a narrower nosed one for
starting off. The hardest was a 50/3.5 macro (the only Zuiko I've done) as
it seemed to be of a harder alloy and the injury also involved the aperture
ring (big hit from the side by the look of it) so that when I'd beaten out
the dint, the aperture ring was a little stiff for the middle of its range
- obviously a little out of round too. I can live with it, given the saving
over a cosmetically good example.
The biggest problem is having the nerve to hit it hard enough - a series of
small taps is required but they have to be very firm taps. A small wooden
mallet works well. Practice on a junk lens first! Keep testing with a
filter until it screws in smoothly.
AndrewF
> Sorry to hear of your mishap. On the subject of
>dented filter rings, I've had good success with the
>wooden dowel and hammer method(that is if the rim is
>not bent too far over). John H. explained this
>technique in a post about a year or so ago and I tried
>it on my Mamiya C 180mm lens, it worked great! You
>cradle the dowel between your fingers, placing it over
>the top of the lens against the dented portion of the
>rim. Then with a hammer, lightly tap the end of the
>dowel, slowly straightening out the dent. I would use
>about a 3/8 dowel and bevel the end to the curvature
>of the filter ring.
>
>If I didn't explain this correctly, perhaps John H.
>could intercede...
>
>John Robison
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