This is very sturdy, locks on the lens very well (Tamron 28-75 E mount). At the widest angle it causes minor vignetting because of thickness, so it may be a good idea to buy larger than what you need, and use step-up-rings. Images shown with a circular-polar filter.
A must have item for any photographer/videographer on the go. I use it on my go to lens sigma 17-50 2.8 (it stays 90% of the time on my camera) and don’t have to worry about screwing on/off my variable ND filter. Quality is very good, I recommend it.