I just bought a Logitech HD Webcam c615
It was recommended to me by the tech support people at Techsmith (Camtasia). I’m including a 15 second test video using it so you can compare to my earlier videos done with the built in webcam on my iMac.
Let me know if you see a difference in your browser. It definitely looks better to me. It was only $50 on Amazon.
This webcam has autofocus, swivels and can easily be moved from one computer to another when traveling.
Not all webcams and not all Logitech webcams work on a Mac, but this one does.
Here’s the link to another video done on the same computer with the built in webcam instead of the Logitech.
Picture quality and even the width of the field are much better.