posted 3-22-09

Items required
1: Some sort of set of goggle frames to hold the iris diaphragms.
I used a pair of ‘I Glasses’ with lenses that simulate an insect’s compound eye. I remove the lenses and use the frames and lens cups.
Edmund Scientifics Catalog #L31091-00 price: $7.95
Anther cheap possibility $3.95 MIT Eye Guard Goggles or
or check these welding goggles for usable frames

2: Two adjustable optical iris diaphragms expensive on Edmund Scientifics ($50 approx)
I purchased on e-bay, 2 for $27.50 - 34mm outside diameter. Another source (also not cheap):
iris diaphragms from Rolyn Optics
On, the cheapest currently (3-22-09) with the maximum opening 25 mm, minimum opening 1 mm
is $29 plus shipping from India,
This source has small-size (19 mm) for $19. Best price I’ve seen. but you may have to adapt to the diameter of the goggles' opening somehow
(these are about two-thirds of the overall diameter of the ones I used.)
Someone put together a very elegant set of variable-aperture antique-looking steamfitters goggles here
This site describes how to make a cheap set of costume goggles (without the diaphragms)

General Instructions

Prepare the goggle frames.In the case of the ones I used, Edmund's "I Glasses," I removed the compound eye lenses and glued the
two iris diaphragms to the ends of the blue plastic cups. Inasmuch as the glasses are made of clear plastic, I then covered the clear plastic
with black electrical tape.
Below is my end-product (apologies for the lousy photo - I had to use a scanner). The 'aluminum foil to tighten rotation' refers to
the fact that the cups rotate, and I was fooling around with some diffraction gratings that provided various rainbow effects when the cups were turned: