Most people into photography will instantly recognize the name K&F Concept as makers of high quality photographic equipment and these GoPro lens filters are no different. Quality multi coated optics are used in both the CPL and ND filters.

With this lens set you get three ND filters (ND stands for Neutral Density - more on this in a minute) and one circular polarize filter.

The CPL filter is a circular polarize lens filter. These are used for reducing glare in your videos and photos. It also helps brings out the deep blue in skies when shooting the sky, clouds, etc.

You can rotate the front of the CPL lens which is a great feature as it allows you to see what effect it's having on your color in real time as you turn it.

The ND, or neutral density filters act basically as 'sunglasses' for your camera's lens and sensor. They come in 8, 16 and 32 stops reduction which gives you plenty of variety and choice.

One fairly typical use of a ND filter would be for taking a photo of a waterfall. You want that classic picture of a static landscape BUT with the water showing movement and flow.

In order to achieve this, you'd have to deliberately overexpose the shot in order to give the water motion however in doing this, everything else in the picture (besides the waterfall) will be blown out and overexposed to the point of almost total whiteness!

Now, if you place a ND filter on the lens, you're forcing the shutter to stay open longer resulting in a perfectly exposed picture with the flowing water in the waterfall.

This is a great lens kit to have in your GoPro gear bag.