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An adjustable iris diaphragm, with up to 10mm clear aperture, mounted in a 30mm diameter barrel. Iris has 4 click stops and a marked scale with ½ stop increments. Iris plane sits approx. 15mm from female end. Adds 12mm to system length.
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Copyright year, Edmund Optics Inc., 101 East Gloucester Pike, Barrington, NJ 08007-1380 USA