Sigma 17-70 with 2x converter v telephoto lens - which for quality?

Discussion in 'Photography Forums' started by StevePn, May 2, 2007.

  1. StevePn

    StevePn
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    Can't afford to get a Sigma 17-70 and a good telephoto lens yet.
    Instead would using a 2 or 3 x converter give good results with the Sigma over a cheaper telephoto lens?
    Steve
     
  2. denno75uk

    denno75uk
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    Probably not a good option. The 2X converter would make the lens a 140mm at the long end which is not particularly long, you lose AF, some IQ and you lose two stops on the aperturemaking it very slow.
    Wouldn't you be able to get the 70-300 APO for around the same money as a converter? Especially if you use somewhere like onestopdigital.
     
  3. RobDickinson

    RobDickinson
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    The 2* convertor converts both the focal length and the apature.

    So 2.8 becomes 5.6, thats the wide end, the long end becomes f9.

    Your camera wont AF past F5.6

    Typicaly long lenses will be built diferently too, and as said above theres prob some longer lenses for the same price as extenders.
     
  4. jonnypb

    jonnypb
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    if money is an issue then as said above the sigma 70-300 APO is very good value for money and will produce good results. Think it's around £115 from one stop digital
     
  5. BananaTiger

    BananaTiger
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    Also, I'm not 100% sure but I don't think that teleconvertors work with EF-S or equivalent lenses.
     

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