How to use the PRISM lens for enlargement

1. Hollow end of lens facing out.
2. Insert into projector. Have lens almost all the way out.
3. Darken room, turn on Prism projector.
4. Back away to 20 inches from surface. Focus should be clear.
5. Back away, pull lens in, twisting. Further back to enlarge, move lens in. Distance enlarges, lens focuses.