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Thread: Is MTF chart reliable ?

  1. #1

    Default Is MTF chart reliable ?

    Eg:

    Sigma 24-70mm f3.5-5.6
    http://www.sigmaphoto.com/lenses/len...62&navigator=2

    Nikon 24mm f2.8D
    http://nikonimaging.com/global/produ..._28d/index.htm

    The Sigma (much cheaper) is a zoom lens, the Nikon is prime. How come Sigma quality apparently better ? Thanks.

  2. #2
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    Default Re: Is MTF chart reliable ?

    should be reliable but funny thing is that they didnt mentioned which F-stop did they took this. and a good MTF chart results should have at least 4-5 F-stops MTF at every lens zoom.

  3. #3
    Senior Member yyD70S's Avatar
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    Default Re: Is MTF chart reliable ?

    Default MTF charts are always taken at the max aperture.

  4. #4
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    Default Re: Is MTF chart reliable ?

    usually 3rd party mtf review (magazine etc) are more trustable than the own maker one.

    but lens also have some variation, who knows whether the one been reviewed is a sharp copy or lemon .

    Itdoes give you more idea on the sharpness of lens. But mtf chart don't give much info on contrast, colour, flare resistence of the lens.

    I thought most mtf chart are taken at wide open and f/8?
    Sony Alpha 700 hobbyist

  5. #5
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    Default Re: Is MTF chart reliable ?

    Quote Originally Posted by chunkeat
    Eg:

    Sigma 24-70mm f3.5-5.6
    http://www.sigmaphoto.com/lenses/len...62&navigator=2

    Nikon 24mm f2.8D
    http://nikonimaging.com/global/produ..._28d/index.htm

    The Sigma (much cheaper) is a zoom lens, the Nikon is prime. How come Sigma quality apparently better ? Thanks.

    Default they are tested at max f/stop. For apple to apple comparison, both lenses should be tested at the same f/stop.

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