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What about vignetting? The rings are very low profile and slightly thicker than an average step ring. Our hands-on experience shows that users shooting with a cropped sensor such as a Nikon D or DX series camera will likely experience no vignetting up to about 17mm, however users of full-frame sensor cameras should expect slight to moderate vignetting below about 24mm, and we therefore don't recommend XUME for super wide lenses on full-frame sensor cameras. Most users will experience no vignetting with normal and longer length lenses.
In practice, vignetting is a product of many factors including focal length, sensor size, specific lens, filter type and brand. There are infinite combinations of these devices so it is impossible to predict your results with your specific set up and workflow. One user reported that he experienced vignetting at 20mm with a zoom lens, but no vignetting with the same camera using a 20mm prime, demonstrating the difficulty in providing definitive guidlines or expectations for every user.
We therefore strongly recommend testing with your camera/lens/filter setup before performing critical work. We have a no-hassle return policy, so the best bet is to try them and return if they don't work out. Most users find slight or occasional vignetting a fair tradeoff for the convenience of using the adapters, and we get very few returns.