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Not scientific but should I expect better sharpness from the 17-55mm

  • 10-01-2009 9:56pm
    #1
    simonp1
    Registered Users Posts: 353 ✭✭


    Nifty fifty at 2.8 and 100% crop

    3185829106_4127e6a116.jpg

    and 17-55mm at 2.8

    3185829098_62fc06c24c.jpg

    I have been told I'm paranoid by a photographer friend...I fear he might be right, what you guy's think??

    Regards

    Simon


Comments

  • #2
    Fajitas!
    Registered Users, Registered Users 2 Posts: 16,624 ✭✭✭✭Fajitas!


    Paranoid :)

    Primes are generally sharper than zooms, you're shooting the zoom wide open, whereas you've stopped the prime down... :)


  • #3
    Anouilh
    Registered Users Posts: 1,826 ✭✭✭Anouilh


    What's the problem?

    One has big bokeh,
    the other does not...


  • #4
    melekalikimaka
    Moderators, Education Moderators, Music Moderators Posts: 10,686 Mod ✭✭✭✭melekalikimaka


    Anouilh wrote: »
    What's the problem?

    One has big bokeh,
    the other does not...

    talkin bout sharpness not dof i thinks


  • #5
    simonp1
    Registered Users Posts: 353 ✭✭simonp1


    Not a problem I suppose, just second guessing spending so much on a lens. :)


  • #6
    Fajitas!
    Registered Users, Registered Users 2 Posts: 16,624 ✭✭✭✭Fajitas!


    Were both crops 100% btw?


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  • #7
    simonp1
    Registered Users Posts: 353 ✭✭simonp1


    Fajitas! wrote: »
    Were both crops 100% btw?

    Yip as close as I could get.


  • #8
    AnimalRights
    Registered Users, Registered Users 2 Posts: 7,067 ✭✭✭AnimalRights


    Did you use a tripod?


  • #9
    simonp1
    Registered Users Posts: 353 ✭✭simonp1


    Hi Animalrights

    yea mini tripod IS off too.

    simon


  • #10
    AnCatDubh
    Registered Users, Registered Users 2 Posts: 6,393 ✭✭✭AnCatDubh


    Fajitas! wrote: »
    you're shooting the zoom wide open

    Your zoom should have a sweet spot (at its best) which normally can be found somewhere mid-way in the focal length combined with mid way through the aperture range. Try it and see if you notice any difference.


  • #11
    Burnt
    Registered Users, Registered Users 2 Posts: 492 ✭✭Burnt


    Scientifically speaking sharpness i.e. resolution is proportional to the
    diameter of the aperture. The focal length is technically irrelavent.
    So you would have to have the same physicall aperture on both to
    make a fair comparison; zoom lenses are a combination of a lot
    of compromises however.


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  • #12
    bmcgrath
    Closed Accounts Posts: 230 ✭✭bmcgrath


    Fajitas! wrote: »
    Paranoid :)

    Primes are generally sharper than zooms, you're shooting the zoom wide open, whereas you've stopped the prime down... :)

    Fajitas has it exactly right :)


  • #13
    simonp1
    Registered Users Posts: 353 ✭✭simonp1


    Thanks everyone for the input I understand that primes > zooms and different lenses have different sweet spots etc and I am being Paranoid...Thanks for putting my mind as ease. I am going to shut up and just shoot:D


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