I made one of these many years ago from parts gotten from Radio Shack. I use cool edit program from the web, (you can expand and zoom the field to better see the actual beginning and ending of the shutter). A cheap red laser pointer, (found in walmart / K-mart around $5), is what i use as the light to shine through the lens. Its very bright and works very well w/ the radio shack photo eye spectrum.
dee
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