learned more about photography and over time I improved my skills as an amateur photographer. I have worked with other types of filters, particularly CPL and FL-D filters, but so far I have never worked with ND filters. I've been able to get good results with it and am happy with this filter so far, although I know I still need to learn more about it. A neutral density filter is used to reduce the light reaching the aperture without messing with the colors too much. This allows you to be creative with shutter speeds. This particular filter is adjustable and rotates to the front of the lens body, allowing the photographer to increase or decrease the level of filtering. At the lowest setting, the filter barely filters; When the filter is set to the maximum filter level, very little light passes through and a moiré pattern is created. I therefore do not recommend setting the filter to this level. To get a feel for how well this filter works, I took my camera outside as a large thunderstorm approached and took a few pictures of one of the cloud formations. I chose two images from this set, one where I didn't use the filter and one where I used it at about 1/4 strength. Although the filter reduces light intensity evenly, the color contrast in the filtered image is much more pronounced and obvious. The most common use for this type of filter is to reduce light levels and then shoot a longer exposure for a scene with movement, such as a waterfall. This is a very nice filter and I couldn't be happier with it. It's very easy to use and works really well. Disclaimer: I was provided a sample of this product in exchange for a fair, honest and thorough review. Even though I received this product for free, I have reviewed and reviewed it unbiasedly and solely based on my experience with it.