Pity the 4/3rds owners....

Discussion in 'Digital SLR' started by RichA, Dec 16, 2007.

  1. RichA

    RichA Guest

    RichA, Dec 16, 2007
    #1
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  2. The lenses do appear to be identical in optical design, but the Olympus has
    three ED elements as opposed to one in the Sigma, and their MTF graphs look
    quite different, the Olympus being superior. Of course that may be in part
    because the Four Thirds system doesn't use the full image circle of the
    basically full-frame lens.

    http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3304&navigator=3

    http://www.olympusamerica.com/cpg_section/lens/dea/products/lens/70-300_40-56/index.asp

    Neil
     
    Neil Harrington, Dec 16, 2007
    #2
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  3. RichA

    RichA Guest

    Kind of hard to be sure when they use different lpm to do the tests,
    Olympus using 20 and 60 and Sigma using 10 and 30.
     
    RichA, Dec 16, 2007
    #3
  4. RichA

    Robert Brace Guest

    Robert Brace, Dec 16, 2007
    #4
  5. RichA

    RichA Guest

    Also, look at the two test shots from the Oly lens. The cowboy
    picture is double-imaged from motion blur and both it and the peacock
    picture are horribly blurred from what looks like residual spherical
    aberration!!!
     
    RichA, Dec 16, 2007
    #5
  6. I didn't notice that, but if Olympus is using higher spatial frequencies
    that would seem to make its charts all the more superior.

    Neil
     
    Neil Harrington, Dec 17, 2007
    #6
  7. Well, you can hardly blame motion blur on the lens.

    I don't see it. And frankly I doubt you can see "residual" spherical
    aberration in that kind of a photograph.

    Don't misunderstand me. I'm not defending Olympus or the Four Thirds system,
    neither of which have any appeal for me. (I'm a Nikon guy.) But your
    original criticism, that the Olympus lens is just an overpriced rebadged
    Sigma, does not seem quite correct. If the lens really is made by Sigma
    that's interesting though.

    Neil
     
    Neil Harrington, Dec 17, 2007
    #7
  8. [some outrageous claim]
    Prepare to wait until judgement day. RichA and proof go along
    like saltwater and electronics.

    -Wolfgang
     
    Wolfgang Weisselberg, Dec 17, 2007
    #8
  9. RichA

    RichA Guest

    Like absolute proof, a signed statement from the Chairman of Olympus?
    Yes, it's come right up.
     
    RichA, Dec 17, 2007
    #9
  10. RichA

    RichA Guest

    I think they've established that some time ago on the Olympus SLR
    group on dpreview.com. If the lens is different, I would hope, at
    that price level that optically it was at least as good as Nikon's
    70-300mm ED because it costs about the same and includes VR. I know
    for a fact the Sigma version of the lens does not match the Nikon
    optically.
     
    RichA, Dec 17, 2007
    #10
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