Review on Tiffen 77mm Neutral Density 0.9 Filter: Enhance Photography with Superior Light Control by Charley Prz

I'm not a professional photographer and I really can't compare this to more expensive ND filters. Regardless, I've used this ND filter a few times to take long exposure shots and it seems to work pretty well. Depending on the incidence of light, there is a blue cast that can be corrected with photo software. There is a thread on the front that allows you to attach the ND filters to each other, which is nice. Overall I'm happy with the quality and now it works for me. Maybe I'll update as I learn more about photography, but for now it's working fine.