Update to Aperture EXIF Lift & Stamp
The sum of it is that exiftool uses tags (think of them as friendly names) for access to various EXIF fields. The tags are specific to the camera type. Cameras I had available to test all had a "Lens" tag for the lens type. And until today, I hadn't heard from anyone of problems with the script.
However, not every camera has a "Lens" tag. Other cameras have a "Lens Type" tag instead. So now I'll check for "Lens" or "Lens Type". I have not waded through all of the camera types yet - I wanted to get an update posted quickly - but will be doing so in the next few days.
If you have problems with the script, please let me know. Either via comments on the blog or through Google+.