This is a question that could provoke many a strong reaction. Second only to the questions like, which is best Canon or Nikon, Velbon or Manfrotto, Pc or Mac etc!!....
Last time I looked (admittedly, quite a while ago), the difference between the APO and non APO Sigma's was only about £40.
Glass is the only real difference between the two, but personally I would go for the Sigma APO one as I seemed to recall it was marginally faster in the auto focusing department comparing it to the Tamron.Though the speed will vary wildly depending on the camera body you are putting it on. However, many have said they prefer the handling on the Tamron competitor.
Would advise you to go along to a camera shop with your own camera body and try both lenses, to see which one you personally prefer.
Good luck
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
Last edited by Joe; 04-03-09 at 10:23.
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