they are really great when trying to keep the rig light. You save about 2-3lbs compared with the regular v-lock plates and also they are a way more solid connection to the camera than regular plates! no vibrations or shaking or flex at all!
you can use them directly as a dovetail on your top stage (modifications for efp style topstages are also available) and they come with 15mm focus rods for direct attachement.
here is the official link:
http://shop.strato.d... V-mount Plate"
(attention, the plates which are sold here are slightly different in construction (see pictures))
the regular price is 725,90 Euro (including 19% VAT).
sold here for 250 Euro (including 19% VAT)
located in Dortmund, Germany
pm or email me: KameraJaeger@gmx.de