Magazine-based visual ISO tests, completely useless

Discussion in 'Digital Photography' started by RichA, Jul 9, 2010.

  1. RichA

    RichA Guest

    You've seen them. Those little 1/2 to 1" pictures of photo segments
    magazines use to "show" you the ISO performance of a camera. They are
    worthless. In many cases, 100 ISO looks like 1600 because the scale
    is too small, and the reproduction simply awful. So why don't
    magazines show some other aspect of the test other than this? It's a
    waste of paper and effort and only makes web-based test sites that
    much more appealing.
     
    RichA, Jul 9, 2010
    #1
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  2. RichA

    Me Guest

    On 9/07/2010 2:46 p.m., RichA wrote:
    > You've seen them. Those little 1/2 to 1" pictures of photo segments
    > magazines use to "show" you the ISO performance of a camera. They are
    > worthless. In many cases, 100 ISO looks like 1600 because the scale
    > is too small, and the reproduction simply awful. So why don't
    > magazines show some other aspect of the test other than this? It's a
    > waste of paper and effort and only makes web-based test sites that
    > much more appealing.


    No, I haven't seen them.
    Most web based tests are flawed too, showing either 100% pixel mapped
    view without taking into account scaling of the whole frame, they use
    some arbitary in-camera NR and sharpness settings (jpeg) or do not use
    an optimum raw converter for the camera's raw files. Exposure accuracy
    and the ability to recover highlights so that optimum exposure can be
    used also have a large impact, as does pattern noise in shadows, both
    mainly ignored by self-appointed "expert" sites like DXO. Comparing
    different formats at same ISO (using same f-stop & shutter speed) is
    also potentially seriously flawed for the purpose of assessing real
    world low light performance. In the end, there's much more
    disinformation out there than useful information. YMMV.
     
    Me, Jul 9, 2010
    #2
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