20pcs 1.5 34MM Zoom Adjustable Iris Aperture Diaphragm Light Regulator for Microscope Digital Camera Telescope with 14 Blades|Microscope Parts & Accessories| - AliExpress
iris shutter" 3D Models to Print - yeggi
Iris ~120mm for Stepper by Maschinist RaumZeitPiraten | Download free STL model | Printables.com