It's a must-have item in your camera bag and for a fraction of the cost of other brands of variable ND filters. So far I've tested it with multiple lenses and 3 different cameras using step down rings in low light and full daylight, low ND2 down to DN32 and so far I haven't seen no X pattern. A huge problem with many variable ND filters, even the most expensive ones. Color cast is also insignificant but like ALL inferior ND filters there will be color cast, hell even a $500 will have some sort of color cast, again at a fraction of the cost to have a barely noticeable color cast, or at least one that cannot be easily corrected in LR Nowadays, I shoot with the Sony mirrorless system and every lens I shoot with on my full frame camera has a thread less than 77mm and vignetting is no longer an issue at any filter range and at any what focal length of the lens and i have been shooting the thing a LOT with my sony. Above are some of the photos I took with the filter, including my Canon 5D series and my Sony A7R series. The first 3 are from my Canon and the second 3 are my Sony lens and I've been shooting the thing A LOT with my Sony. Above are some of the photos I took with the filter, including my Canon 5D series and my Sony A7R series. The first 3 are from my Canon and the second 3 are my Sony lens and I've been shooting the thing A LOT with my Sony. Above are some of the photos I took with the filter, including my Canon 5D series and my Sony A7R series. The first 3 are from my Canon and the second 3 are my Sony