new AOL tins; limits on wide-angle pinhole?

The ubiquitous AOL trial CDs have begun appearing in a different
packaging in our neighborhood; a metal tin slightly larger than a CD
and about 1/3 inch in height. From this sprang several questions: if
this was made into a pinhole, how "wide angle" of a pinhole would
it be (I can do the calculation if given the formula, I think) and is it
going to cover the whole area of the back? I guess what I mean to
ask is what are the limits of the "image cone"?

Cheers,
Jane

-- 
J.E. Patterson
www.lightjunkie.org | www.luxumbradei.com