M12 to C/CS Mount Convert Ring, M12 to C/CS Mount Adapter, C/CS to M12 Lens Holder

I felt like I was doing damage to the threads on both the adapter and the camera. I bought a few and all of them wound up needing to be twisted in a very intentional way. All of them have some thread damage and and some metal flaking but will still thread right.

It looks fine by photo, but some dust exists in the threads, not all. It causes difficulty to screw in. It is class B item.

It got the job done. The threads aren’t great, but I was able to clean them up with a utility razor blade.

These do not fit properly, the inner diameter and thread is correct and M12 lenses screw in ok. However the outer thread for the C mount is not correct.The standard for C mount is 1" with 32 threads per inch, I have measured the thread on these a 1" but 28 threads per inch. I can get about one turn before it tightens up.

Adapter screwed in fine to the CS and the C mount for GoPro Hero 4 Black Back-Bone mod. Threads are a little dirty and could use some lubricant or antisieze, but definitely screwed onto both mounts without issue.

These will not thread properly into CS cameras. M12 thread is perfect. Damaged the threads on a FLIR camera when attempting to start.

I should have read the reviews. Both the interior C/CS mound and interior M12 threads are wrong! Doesn't fit anything standard. I'm not sure how this is even a product?

This part does not screw into a C/CS mount camera -- I think the tread pitch is incorrect.