I am thinking of purchasing a set of Zeiss ZF lenses to use with my Ef Mount Video Camera and a Nikon DSLR. This would mean I would need a lens adaptor that would let me switch quickly on set, and not wear out any pieces from the stress involved with frequent changes. Does anything like this exist? I spoke with BH Photo, they said no. I read many of the reviews of what is out there and couldn't find anything recommended for this type of use. Any reco's or is this just a bad idea?