As a professional video producer, I like to have tools that are durable, practical, and save space in my camera bag. This K&F set was just what I was looking for. Mine is for my 82mm Sigma Art 24-70 lens, which is my primary documentary lens.

You get:
- A screw-on magnetic filter holder. Attach this to your lens, and the other pieces magnetically snap into place without threading.
- A combination ND and polarizing filter. You can use the attached screw to lock the polarizer into position once you've spun it to where you want it, leaving the ND portion free to spin and adjust. When I'm shooting outside I like to keep my aperture, shutter speed and ISO locked, and adjust exposure with the variable ND filter. So the combo ND/polarizer filter is the way to go.
- a 1/4 black diffusion, great for a subtle softening effect for interviews
- a magnetic lens cap. I like this so I don't have to remove the magnetic filter holder to replace my stock lens cap. The K&F cap is metal and feels very secure and protective. It's also quite thin, which is a bonus.
- a well-designed carrying case with individual soft pockets for each piece, with a secure zipper and a magnetic flap. If you're like me and leave the mounting ring and the lens cap on your lens most of the time, you might not need this larger case and can downsize to one or two smaller cases to save space.

If you are experienced with filters of this type, as I am, you'll be fine. Otherwise you'll have to do a little research on proper use. There is no documentation regarding how to use a variable ND in the kit, just a great set of filters. Even the box doesn't really tell you anything. But as with most things in photography, a little personal experience is probably the best teacher.