CMU Cam Lens specifics

I am trying to figure out the focal length and F stop of the lens sold by Seattle Robotics with their CMU Wide Angle Lens Camera. I know the
original CMU lens is a 4.9mm F2.8 lens, but I would like to know about the wide angle lens they sell. Has anyone done any rough calculations on this lens?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.