Sigma OS 50-500 vs 150-500 vs 80-400 vs 120-400

Started May 28, 2012 | Discussions thread
dholl
OP dholl Veteran Member • Posts: 3,233
Re: Sigma OS 50-500 vs 150-500 vs 80-400 vs 120-400

ye gods, there's another one:

http://www.dpreview.com/news/2005/11/22/sigma_170-500mm

why do Sigma make so many variations? It's really confusing...

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