K. Mark Caviezel (KC0HJQ) has built a commandable 35mm camera:
Here (above) is the package prepped for flight.
An Alinco DJ-C1 radio (TOP) provides the RF link. Below it is, I think, a Basic Stamp providing interpretation of the incoming signals and triggering of the camera. And at the bottom, the camera. It is currently disconnected from the controller (Cam1 connected to Cam2 makes that connection).