Chamonix now has the Iris diaphragm style variable diameter lensboard. It has a
      max openning of 94mm with usable mounting openning of 90mm.The weight is
      230 grams (8.11 oz). The outside diamater is 98.2mm, it can be used on the Sinar  
      style lensboard.


The price is $325.00 plus $25 EMS internation shipping to USA. If you need it mounted on a Sinar  aluminum lens board, add $40.