What's the difference between these two lenses

Discussion in 'Photography Beginners' Forum' started by bbirnie, Sep 21, 2010.

  1. bbirnie

    bbirnie TPF Noob!

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    Hi,

    Both of these are 70ish-200mm with max F of 4-5.6 lenses but completely different looking, and completely different sizes. Can someone explain the advantages of the more expensive one ?

    Thanks




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  2. Josh66

    Josh66 Been spending a lot of time on here!

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    Well, the most important difference is that they're different mounts....

    The top one is a Canon lens, the bottom one is Nikon.

    The Canon one is an 'L' lens, with IS. I can't tell if it's the f/2.8 or f/4 version... Looks like f/4 though.

    The Canon one will stay a constant aperture throughout the zoom range. The Nikon one likely won't.

    I don't really know anything at all about that Nikon lens, but the Canon 70-200's are very good.
     
  3. bbirnie

    bbirnie TPF Noob!

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    Ok sorry, I should've specified what answer I was looking for........

    I was just using those pictures as examples, lets pretend they were the same mounts, the same brand, same max-app........ Im just wondering how two lens of completely different sizes but offer the same mm range differ.
     
  4. Josh66

    Josh66 Been spending a lot of time on here!

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    Cheaper construction, different number of groups/elements, different grades of glass, etc...

    Lenses like the bottom one usually have a smaller max aperture while zoomed out - while lenses like the top one don't.

    Focusing speed and accuracy will probably be very different too.

    edit
    An example of the cheaper construction - the bottom lens has a plastic mount (from what I can tell...), the top one has a metal mount.
     

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