What I want to check is that the 60mm Hasselblad Ring adapter, once bought, will fit my "Foundation Kit" holder (see 2/3 way down this page : http://leefilters.com/index.php/camera/systemtableOption:colours/showall:1/) that I bought and still use for my Nikon gear, or do you need a medium format holder to hold the medium format adapter? Obviously the adapters I bought for my Nikon lenses don't fit the Hasselblad but can still be used for my Nikon with the holder.