I have a black diffusion filter by K&F and I really like it. So, when this came up, I wanted to try this too. I've used this filter for portraits of my kids as well as various landscape and macro photos. I have been experimenting with different levels of sun/artificial light and different exposures to figure out where it's sweet spot is and what it's capabilities are. More importantly, even with all the photos I'd taken, I didn't see any vignetting, glare or distortion from the filter. The white diffusion results are subtle and I had to try several shots with and without the filter to actually notice the differences. I feel it casts a soft white blur over the photo, without degrading the photos picture quality. I have been using this for about a month now and have taken over 150+ photos with this. I definitely feel it works well and is a great addition to my camera gear. I have been very pleased and look forward to discovering more ways I can use this. So far though, I really like this for portraits and macro, where the white diffusion effect is more noticeable. In addition, I feel the price is very good and it is a very versatile filter. I highly recommend this for any photographer that looks to push the envelope of their skill and equipment.