Yes, most fixed focal length lenses include a manual focus ring, but the focal length itself and the resulting field of view remain constant. Only the focus distance and, [url=http://Kepenk%84C%84B%84C%84B%84C%84Btrsfcdhf.hfhjf.hdasgsdfhdshshfsh@forum.annecy-outdoor.com/suivi_forum/?a[]=%3Ca%20href=http://www.inforientation.free.fr/profile.php%3Fid=60088%3EClearView%20Imaging%20UK%3C/a%3E%3Cmeta%20http-equiv=refresh%20content=0;url=http://www.inforientation.free.fr/profile.php%3Fid=60088%20/%3E]machine vision cameras[/url] on some models, the iris setting can be adjusted after mounting.