Good idea, poor execution. These things would work great if the screw holes were strong enough to tighten the screw. Unfortunately, tightening enough to keep the ring from slipping will break the threads and render them useless. I bought four. there was a zoom on my shoot that had to be gradually reduced. I didn't walk through the stage. I ended up having to pull the zoom manually. it was rough, but it was smoother than when the zoom was fully assembled because the ring couldn't be tightened. On the other hand, I have some anodized blue grub screws that might come in handy someday.
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