Il filtro ND K&F Concept 67mm ND2-ND32 è compatibile con tutti gli obiettivi della fotocamera che richiedono una filettatura Ø 67mm. Il copriobiettivo e il paraluce devono avere una filettatura più grande (ad es. 67 mm ND ha un copriobiettivo da 72 mm) 

see you have chosen the K&F Concept system which comes with a 77mm mounting ring. You need to see what port sizes your 7 lenses are if they are all the 77mm which I doubt you can use all 7 lenses with this system. For the lenses that don't have the 77mm mounting ring size, you need to buy an adapter from 77mm to the size of your lens mounting ring. Note that if you have a lens with, for example, an 82mm diameter for the mounting ring, you cannot use the 77mm K&F Concept system and will need to upgrade to a larger size that is the same size as your largest lens. Each adapter ring from K&F Concept would cost around $65. 

I have the filters in 77 mm. My original lens hood fits just like before. 

Probably because of the ingenious magnetic system and of course because of the 72mm diameter 

I think the low vignetting comes from the lens hood. The filter itself does not. 

That works with my lenses, only the magnetic cover doesn't fit through with a lens hood, ie if you want to put on or remove the lens hood with the cover mounted, it gets stuck on the cover. With cylindrical lens hoods, it is fiddly to remove or attach the cap with the lens hood installed because the cap has no handle. 

Hi, if you want put len cap , doesn't need remove the magnetic basic ring, thanks. 

I haven’t checked the accuracy of the stops. But the quality is great. At 5 stops at f4.5 24p 1/50 100ISO the image is perfectly exposed at direct bright sunlight.