have been shooting with 35mm cameras since I was 16 and that was 56 years ago. I have a collection of cameras that I use and lots of accessories including filters that I can use across my entire camera collection. I have always found it a hassle to change filters while shooting, screwing them on and unscrewing them to remove them. It takes time and coordination. Then about a year ago I was introduced to magnetic filters. Magnetic filters eliminate the need to screw on and off the filters you use. There is an adapter ring that screws onto the front barrel of the lens and the outer edge of the filter is magnetized so instead of screwing on and off the filter, it magnetically attaches to the adapter and sticks. To change the filters you just have to take off the filter you want to remove and put on the filter you want. No screwing required. I am sold on them. I now have magnetic adapters for each of my main lens diameters and am slowly replacing my traditional filters with the magnetic filters. Most brands of magnetic filters are compatible with each other, so you can mix and match them however you like. I have been buying filters from K&F Concepts for a long time. I am confident in their quality and know that they stand behind their product and for the price you can't go wrong.