As far as I am understanding, you want to buy a replacement lens for your HD-6000, is that right? For that you will only need:
- access to some store that sell in a low volume base;
- size specifications, the lens will need to fit into the camera;
- right now, the field of view is all you need (as far as I know), it is calculated from the focal length of the camera and the camera sensor;
Don't hurry about the autofocus.
The following site may help:
http://retired.beyondlogic.org/imaging/camera1.htm Best,
Rafael