bent filter thread

[valjo]

I bought this lens in this condition of the filter thread
How to fix this?

[marcusBMG]

Only fix for this that I can suggest is to drill/grind that section of thread out.
Normally filter threads are bent inwards a bit and it is possible to judiciously bend them back out again - there are some discussions on the how to here on mflenses. But this downward ding - SOOL!

[valjo]

[Lloydy]

I have machined damage like that off, there's usually enough thread to be able to loose a couple of threads. Without a lathe I would use wet and dry abrasive paper on a sheet of glass, steel or any hard flat surface and gently abrade the damage back. If the glass is close to the front edge use decoraters paper masking tape on the glass, the adhesive isn't strong enough to damage the coatings.

I have also scraped - chased a damaged thread clean and back into some kind of shape with the blade of a craft knife, the angle of the blade nearly matches the angle of the thread. This is slow, and there's the risk of the knife slipping, it's not the easiest option but it can work well.

If the thread is restored to some kind of good shape but it still requires some force to screw anything in I use a step ring and leave it in place. The go between common sizes so a 49mm lens becomes a 52mm. I've used a step ring on a badly damaged filter thread by removing the damaged portion of thread out completely, but leaving the outer shell of the lens intact, and then gluing a step ring in place, use a non hard setting glue so it can be removed if necessary.

[RSalles]

It happen to me to think about this tool:

http://www.ebay.com/itm/Neewer-Pro-DSLR-Camera-Lens-Vise-Tool-Dent-Filter-Ring-Adjustment-Symmetric-Dent-/261982710916?hash=item3cff62ec84

Maybe it can help.

Cheers,

Renato

[valjo]

[tb_a]

[tb_a]

The "Neewer" filter ring repair tool is very nice and handy. All of my dented filter rings have been repaired within a few minutes and are all usable for filters again.
Sorry, was too lazy to make some before and after pictures.....

BTW, the handling is absolutely foolproof. It worked for filter ring diameters from 37mm up to 55mm and even restored the damaged thread on one lens by turning the tool clockwise and backwards when tightened not too strong to still enable some movement.

Here is the specification of the tool: http://www.amazon.com/gp/product/B00J5F72AC?gwSec=1&redirect=true&ref_=s9_simh_gw_p421_d48_i1

[RSalles]

Great, thanks for the feedback, next month I'll try out the same model,

Cheers,

Renato

[tb_a]

BTW, the tool is also quite helpful to disassemble the front element from the lens when it's just screwed in like e.g. the Topcor 9cm LTM lens.
I've cleaned this lens internally by using this method. So it's actually a "multi purpose" tool.

[Nordentro]

Nice tool!
I bought one too from china with free shipping:

http://www.ebay.com/itm/191697118381?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT