As a photographer, I really try to make sure that I only use reliable equipment. K&F has done a great job of being a reliable low-cost camera equipment company. I have some of their other pieces of equipment and continue to be impressed with their dedication to superior build quality and attention to detail in their products. I found the filter screwed directly onto my lens with no problems and was also able to remove it without any problems. Unfortunately I couldn't take long exposure as I don't live near a waterfall and when I got this filter the weather really didn't cooperate with me. However, I held the filter to the lens without screwing it onto the lens, so that I could see the difference between the picture with the filter and the other. In this type of test, you can see a properly exposed image and a slightly cloudy image clearly by showing only the "hot spots" of light in the photo. I took a few photos with the filter installed and found there was no edge vignetting and since the glass is high quality I didn't notice any ghosts either. Overall, this is a very good option for a budget ND lens filter. that there is no edge vignetting and since the glass is of high quality, I did not notice any ghosts either. Overall, this is a very good option for a budget ND lens filter. that there is no edge vignetting and since the glass is of high quality, I did not notice any ghosts either. Overall, this is a very good option for a budget ND lens filter.