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DPChallenge Forums >> Hardware and Software >> Teleconverter for Sigma 80-400 f/4.5-5.6 EX APO OS
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 12/02/2006 10:58:13 PM · #1
I am looking to buy a teleconverter for my 80-400 Sigma lens (for canon) and wanted to make sure I got one that worked well with it. Anyone have any recommendations or experience with teleconveters?
12/02/2006 11:08:45 PM · #2
Get a Sigma teleconverter.
//www.sigmaphoto.com/lenses/lenses_tele.asp
 12/03/2006 12:52:42 AM · #3
you can't use on on that lens - theoretically. So says canon as it makes the base aperture too small for AF.
YOu lose one stop with a 1.4tc and 2 stops with a 2x TC conveter.
Your 300D won't focus automatically.
you'll also lose image quality.
see if you can borrow one to try before you buy.
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