While these are good quality filters, they have a bad tendency to have the glass element pop out of the filter ring. This has happened to me on an ND16 and also the UV filter. Sure, the filter ring stays on but if the glass keeps popping out, you’re forced to replace them constantly if you hit them just right after a bump apparently.
Thank you for sharing such good experience about the product. Your review is very important to us. We always listen to our customers carefully. It will help us to better improve the product. Thank you!