The Small Iris card is the size of a standard business card 3.5" x 2". It functions as a mechanical iris similar to those used in photography aperture mechanisms. A tab on the card can be manually rotated to progressively open the hole in the center of the card up to a maximum size of one inch. The card varies in thickness, but is approximately .09" thick at its thickest point. See the video below for a demonstration of the card. This listing is for the fully assembled card; the kit version that need assembly can be found here.
- Holding the card near the center will pinch the moving parts and make them unable to move. It works best to hold it by the edges as seen in the video.
- Most people don't know what to do with a card like this if you just hand it to them. It is usually a good idea to show them how it works as you are giving it to them.