Which 70-200 2,8?

Started Nov 18, 2011 | Discussions thread
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LeonXTR
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Which 70-200 2,8?
Nov 18, 2011

I have decided to upgrade from my 200mm f/2,8L,which i plan to sell,to a more flexible 70-200 telezoom for my 5DII.

I really don't want to loose the wide aperture,and the ability to use with AF my 2X converter,and i have set my budget at a €1500 cap.I would like the 70-200f/4L IS but this would nullify my 2X converter,which i find useful on some occasions,so the way i see it,my choices are:

a)A new Canon 70-200f/2,8
b)A used Canon 70-200f/2,8 IS gen1
c)Sigma's 70-200f/2,8 OS

My questions are these.I have heard bad things about Canon's 70-200 IS (1st gen) image quality when used wide open @ 200mm,are they any true?Is the Sigma compatible with Canon's 2X converter?And finally,how true are the horror stories about Sigma's quality variation from lens to lens,specifically the front/back focusing issues?

My other(a bit crazy) option,is selling both the prime and the converter and saving up for a really good lens is the Sigma 120-300f/2,8.Any one having experience with that lens?Is it worth the €2500?
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 LeonXTR's gear list:LeonXTR's gear list
Canon EOS 5D Mark II Canon EF 200mm f/2.8L II USM Canon EF 70-200mm f/2.8L USM Canon Extender EF 2x II Sigma 105mm F2.8 EX DG Macro +5 more
Canon EOS 5D Mark II
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