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auto-iris
auto-iris n. 
/ˈɑdoʊˌaɪrəs/ chiefly Photography a facility by which the iris of a camera is adjusted automatically when a picture is taken.
Brit. /ˈɔːtəʊʌɪrɪs/
, /ˈɔːtəʊʌɪrɪs/U.S. /ˈɔdoʊˌaɪrəs/
, /ˈɔdoʊˌaɪrəs//ˈɑdoʊˌaɪrəs/ΚΠ
1941 Oakland (Calif.) Tribune 4 June d7/4 (advt.) Graflex... Auto iris, $150.
1987 Pract. Photogr. Dec. 15/4 You'll lose the auto-iris facility, ie the lens won't close down automatically when the shutter is fired.
2001 P. Wheeler Digital Cinematogr. 46 I found that by setting the auto-iris to have a slow reaction I could safely leave it switched on.
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