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Thread: Review - Sigma 18-50mm F2.8 EX DC

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    Moderator ortega's Avatar
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    Default Review - Sigma 18-50mm F2.8 EX DC

    Sigma 18-50mm F2.8 EX DC

    for those who want to know, I did some tests shots and post them here
    make your own conclusions about the quality

    All images taken using a Nikon D80, ISO 100, Aperture priority



    Resized full frame @ f8 and f2.8 (tripod mounted)
    note the vignetting on the f2.8 image

    now at 50mm uncropped images


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    Moderator ortega's Avatar
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    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    Next some 100% cropped images

    100% Crop - Center from the 18mm shot


    Last edited by ortega; 29th August 2007 at 10:54 PM.

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    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    100% Crop top right hand Corner from the 18mm shot


    Last edited by ortega; 29th August 2007 at 10:55 PM.

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    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    Next, CA tests at different aperture settings

    All images taken with the same exposure using manual mode






    Last edited by ortega; 29th August 2007 at 10:58 PM.

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    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    Magnification - manual focus set to minimum
    for greatest magnification at maxumum focal lenght

    image resized to 700px wide

    Bokeh

    set to get minimum dof and maximum oof of background
    image resized to 700px wide
    Last edited by ortega; 2nd September 2007 at 02:21 PM.

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    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    I have also at the same time done the same test for the

    Tamron SP AF17-50mm F/2.8 XR Di II LD Aspherical [IF]

    and the

    Nikon AF-S DX 18-70mm f/3.5-4.5G
    Last edited by ortega; 31st August 2007 at 01:49 AM.

  7. #7

    Default Re: Review - Sigma 18-50mm F2.8 EX DC

    the pix look a little soft @f2.8. does it improve by f4.0?

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