Vorneweg, the filter does exactly what I expected from him. Exposures to be extended even in daylight by a multiple. In some cheap filters to do so like to experience that the sharpness of the images a little suffering. Quite different in this filter. I could even not notice any loss of sharpness. The filter gets yet only four stars because it greatly, at least on my Tamron 17-50mm VC vignetting. Although the shading at the edges can be removed in many image editing programs, but means additional work. Otherwise, I am very satisfied with the performance of this filter, considering the price.
