Quote:
Originally Posted by bojan
It is possible with a proper tool, similar to the one on the on the image below.
I made it specifically for a specific job.
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Hi Bojan,
That's a very nice special tool for the job.
I have another design that I was going to use to repair a similar dent on a larger lens. (see diagram). Basically it's a circular disc with a segment removed
(Shown in RED). To work well it would need to be sized to just under the diameter of the internal filter thread of the lens and be radiused at the "corners" (intersection of the chord and the circumference of the circle.) in order to ease the dent back in to shape. It might be best if the disc radii/corners were transitioned over a much longer length to
ease the dent back in to shape. It is rotated using a spanner or such from some feature either cut in or welded to the repair disc - it should gradually render the dent back to smooth with some care and some lubricant on the dent.
The downside on anything like this is that it would need to be custom made for the size, but may be worth it to effect a repair on a damaged lens. There also might be a concern with some damage to the crest of the thread so some experimentation/care/rework may be required.
Another possibility
if it's a thin lens rim that's damaged, might be a clamp with some appropriately cut radiused blocks: one on the inside of the filter thread the other on the smooth outer surface of the lens.
Best
JA