Originally posted by THoog That's a common problem with Sigma lenses and some software. The only identifying data actually recorded in the EXIF is an ID number. The software guesses the lens based on the ID number and focal length. If Sigma used the same ID number in more than one lens and the focal length changes, the software may change its guess.
TH: That makes sense because every other after market lens I use (including Tamron, Leica and Vivitar) shows the lens focal length at a minimum. The thing is over time you forget which SIGMA you utilized (I have several--their auto drive in the lenses are generally very quiet and fast). Oh well, it gives you incentive to try the lot I guess.
Thanks for taking the time to explain the phenomena.