It was only a few months ago that we covered a project showing you how to build a mechanical iris window shade. Don’t have time to build one yourself? CalebKraft is selling a 40 inch Mechanical Iris on Etsy. It can be used with a motor to close or open. This particular version is made of PVC and ABS.
This mechanical iris has a 26″ wide opening and weighs 31.2 lbs. Costs $500 at this time.