I got this kit to fit my camera.I did not try it on a go pro, but I find the idea simply genius. Not only it allows using standard filters, but it allows adding a protective cap to the action camera and use other accessories. Not all accessories would fit, for instance an external focal doubler (because of focus) or a wide lens adapter would not make sens. But I found it pretty interesting to be able to add a square filter holder and reuse some existing filter for a special situation. I’ll have to find an equivalent for my own action cam.The filters themselves are good, they fit with my existing lens, and also tested with a step-up ring for my new camera, and they work good in all cases. The CPL filter is pretty effective, you can make the image on the TV set disappear totally. I took some photos outside, it works correctly, I must admit the preview is different on a mirrorless since the image brightness tend to auto-adjust, this is slightly different from with a (D)SLR eyepiece. The image was great, the sky kept similar colour, but the trees haves more details and contrast.The box is good, but I find it a little bit bulky, this is not the kit, there need to be some inner space for the adapters. I should have picked a smaller package.The caps snap correctly, The two finger operation is my personal preference for caps. There is a slot on the side, but it does not go through, so there is no way to install a small rope.Overall, this is a good kit, I can't wait to test the ND filters.

K&N filters have been around for a long time because they perform as advertised. I have been buying these filters for my cars, trucks and motorcycles and never had any complaints. I am getting more power and a little more mileage to the gallon, every bit helps in Texas.

Always run these great filters, more power and saved a bit on milege on my new titan

need more instructions to assist with accessories. Do like promptness.

the cross on the ends is pretty strong, more so than with other nd filters I own

Great little camera and accessories make it all the more versitle

The Ak-R1 is the must have when you are buying a Godox Flash with a round head. I have bought this set together with the Godox Speedlite V1 for Pentax. The accessories set is packed in a hardcase, with room enough to fit all the pieces. The accessories are magnetically-attached to the flash. The kit contains a snoot, four-way barndoors, and a honeycomb grid, Conversely, a near-180-degree dome, a wide lens, and a bounce card with a frame are provided to expand the beam. Finally, a filter set with three amber CT filters and one green fluorescent filter are also included. The set feels very premium and works great!The service of the shop was very good, a fast delivery and a secure way of packaging!

Came with more accessories than expected, and worked nicely.