http://img35.imageshack.us/img35/6904/screenshot20120522at111.png
my group member said its annular but online says there is only disc or iris diaphragm. please help!
my group member said its annular but online says there is only disc or iris diaphragm. please help!
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It is an iris diaphragm. When you move the little lever, the diaphragm opens and closes from the outside in.
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A small one