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The ND values of the three filters are different. In order to avoid the phenomenon that the wide-angle camera and the medium-telephoto camera are properly exposed and the telephoto camera is under-exposed, the light reduction values of the three lenses are slightly different. For example: ND8 for wide angle, ND8 for medium telephoto, ND0 for telephoto ND16 for wide angle, ND16 for medium telephoto, ND8 for telephoto ND32 for wide angle, ND32 for medium telephoto, ND16 for telephoto Wide-angle ND64, medium telephoto ND64, telephoto ND3 The ND & PL filter is also the same as the ND value distribution of the ND filter 

Works fine throughout the range on my 10-20 wide angle lens on a cropped sensor. Although I suspect that 10mm would be the absolute limit, any wider and I think vignetting would occur. I don't use the extreme 10mm end that often however I was expecting some vignetting but I seem to have been lucky and gotten away with it. This is a really nice set of filters. Hope this helps. 

So with my sigma 10 20, only a little with 11 mm but no longer visible with 12 mm (aps-c) 

Yes, the black camera will be available on April 2020.