If you don't have exiftool, as William Lloyd suggested, you can also look at the EXIF with Preview.
Open the original master image file in Preview and and open the "Tools" menu from the main menu bar. Select "Show Inspector" and open the "Exif" tab. For example:
What does the Lens Model and lens id show?
I looked in Aperture under "Exif" as well as Preview under Exif. They both say the same?????
Then that is how MacOS X interprets the EXIF tags.
Send a bug report to Apple: Apple - Aperture - Feedback