I'm looking for a Webcam with large aperture and shallow depth of field, similar to the F 1.8 Canon lenses, so far It has been really difficult since most of the specifications for any webcam are meant for home users.
Please give your thoughts.
closed as off-topic by mattdm, MikeW♦, John Cavan♦ Jan 11 '14 at 20:55
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Webcams typically have rather small image sensors. Whatever the aperture they have is still going to have deep if not infinite depth of field.
Therefore I'd suggest you try instead to find a real camera that allows using it as a webcam. Point-and-shoot type of cameras still usually have a rather small image sensor, but the depth of field is not so readily up to infinity, especially when focused as near as webcams typically are focused (if there is a focus function on a typical webcam).
For a system camera level of shallow depth-of-field you'll really need a system camera, for example a Canon dSLR and that f/1.8 lens you mentioned.