What is Reddit's opinion of Neewer Camera Lens Vise Repair Tool for Lens and Filter, Ring Adjustment Range 27mm to 130mm, Steel Construction?

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Depending on the severity of the damage to the threading and your willingness to put strain on the lens, I’ve had a lot of luck with the tool linked below. I’ve used it to tension out broken/dented filters when restoring vintage lenses.

https://www.amazon.com/Neewer-Camera-Repair-Adjustment-Construction/dp/B07NJS1RML

Aside from sending it to a professional, I really cannot think of a better option.

I’ve found that the glass elements in lenses tend to attract sharp objects, so I’ve made it a point to never use any tool that I couldn’t stand tapping the glass with. I would really suggest not cutting the ring.

I used this exact tool: https://www.amazon.pl/dp/B07NJS1RML?ref=ppx_pop_mob_ap_share

If you've got steady hands and patience, there is a tool called a "Lens vise", which if used carefully, should be able to restore that to the point where you can use filters again.

https://www.amazon.com/Neewer-Camera-Repair-Adjustment-Construction/dp/B07NJS1RML

I stress care and patience, because if you do it wrong, you run the risk of making things much worse.

But I was able to repair the filter ring on my EF 100mm f/2.8 macro, which is one of my favorite EF lenses, so it does work.

There are tools made specifically for this:

https://www.amazon.com/Neewer-Camera-Repair-Adjustment-Construction/dp/B07NJS1RML

https://www.amazon.com/DSLRKIT-Repair-Filter-Ajustment-Steel/dp/B00SYBYTZO

Looks like the retaining ring is fine, but the threading on the lens barrel is certainly bent. You can try this product to bend the threading back out in order to unscrew the retaining ring from the lens barrel.

https://www.amazon.com/Neewer-Camera-Repair-Adjustment-Construction/dp/B07NJS1RML