[Leica] Leitax Adapters

[Frank]

Is anyone using the Leitax adapters with the semi automatic iris shut down capability?  ( Typically the Leica R lens to Nikon body type, but there may be others)

User experiences?  Do you find the stop down capability useful?  

I wish to use it for opening up the lens for focusing at full aperture, then shutting down for taking the pix.

TIA

Frank Filippone
Red735i at verizon.net