FermiCG takes a look at how to create and animate a diaphragm like the ones you might see in the iris of a camera using a simple technique in Maya.
Check out the tutorial for Creating an Animated Iris Diaphragm in Maya here.
FermiCG writes: In this tutorial we are going to model and animate an Iris diaphragm which is seen in camera and microscope. Though this tutorial is meant for Maya any 3d application can produce the similar result by following this tutorial, but some steps may vary accordingly. Before jumping in to your 3d application just go through the tutorial and do it later.