Inspired by this photo, (testing hosting on Flickr):
So first I cut "AA" and tried to take pictures through it:
- The first thing you need is a camera with a big sensor, because the camera's aperture will also be bigger. I suspect the effect will take the smaller of the 2 apertures: yours and the camera's. So with a small camera, you need to cut really small holes. With phone cameras this is almost impossible.
- Set your aperture to the widest possible.
- Seems like you also need manual focus, to make the light sources out of focus.
- You need point light sources, so small and far away. Fluorescent tubes are bad.
- Since they're so far away, zooming makes the image bigger. I can't figure out what this does to the effect, though. Increasing focal length increases DOF, but if the aperture is kept constant, increasing focal length also increases the aperture's physical diameter.
- Image becomes much darker, because your aperture blocks most of the light.
- The combination of zoom + dark means you have to use long exposure times and high ISO, and run the risk of shaky pictures.