Originally Posted by JMS 
Re: variable aperture zooms showing as a single aperture: this is normal behavior. Only a single aperture set can be transmitted via the "A" contacts. For AF zooms, the "actual" aperture data is transmitted via the digital contact- the same way focusing distance and focal length are transmitted.
That would explain why I only seem to get one f-stop number. Any particular reason though it reads f/1.2 on my 70-300 zoom lens? Is this something that could be solved by TC surgery?