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Thread: Help in explaning picture angle focal length for Lenses

  1. #1

    Default Help in explaning picture angle focal length for Lenses

    Hi there folks. I need someone to explain what this means:
    "AF-S 50mm lens a fast, single-focal-length lens with normal picture angle (when attached to a DX-format SLR, the picture angle is equivalent to a focal length of 75mm in FX/35mm format)"

    I own D300 & looking to buy this lens, but not really sure about the "picture angle equivalent to 75mm bit".

    Could a kind soul explain or point me in the right direction?

    Thx in advance.

    Cheers.

  2. #2

    Default Re: Help in explaning picture angle focal length for Lenses

    Google about crop factor
    "i don't see what you mean, because i can't"

  3. #3
    Senior Member ZerocoolAstra's Avatar
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    Default Re: Help in explaning picture angle focal length for Lenses

    Quote Originally Posted by The Hulk View Post
    Hi there folks. I need someone to explain what this means:
    "AF-S 50mm lens a fast, single-focal-length lens with normal picture angle (when attached to a DX-format SLR, the picture angle is equivalent to a focal length of 75mm in FX/35mm format)"

    I own D300 & looking to buy this lens, but not really sure about the "picture angle equivalent to 75mm bit".

    Could a kind soul explain or point me in the right direction?

    Thx in advance.

    Cheers.
    wah... D300 is your first DSLR??
    yummy
    D300 is a DX-format DSLR
    D700/D3/D3X are FX-format DSLRs

    Same lens on the 2 different types of DSLRs, you'll see differently through the viewfinder.
    Exploring! :)

  4. #4
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    Default Re: Help in explaning picture angle focal length for Lenses

    Easiest way to explain is -

    Basically, it says "If you zoom to 75mm on a full frame, the image (captured on the sensor) will be exactly the same as that on your DX SLR using the 50mm lens." This is determined by the crop factor*lens focal length. In other words, DX can only capture a smaller portion of the image produced by the lens.

    The 35mm format is a baseline, if not the whole world will be haywire. :P
    Last edited by sebianos; 2nd November 2009 at 10:10 PM.
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  5. #5

    Default Re: Help in explaning picture angle focal length for Lenses

    Quote Originally Posted by sebianos View Post
    Easiest way to explain is -

    Basically, it says "If you zoom to 75mm on a full frame, the image (captured on the sensor) will be exactly the same as that on your DX SLR using the 50mm lens." This is determined by the crop factor*lens focal length. In other words, DX can only capture a smaller portion of the image produced by the lens.

    The 35mm format is a baseline, if not the whole world will be haywire. :P
    Thx Mate.

  6. #6

    Default Re: Help in explaning picture angle focal length for Lenses

    Quote Originally Posted by ZerocoolAstra View Post
    wah... D300 is your first DSLR??
    yummy
    D300 is a DX-format DSLR
    D700/D3/D3X are FX-format DSLRs

    Same lens on the 2 different types of DSLRs, you'll see differently through the viewfinder.
    I was using an Olympus before.
    Oh not my first just that I'm seriously going into photography now.

  7. #7

    Default Re: Help in explaning picture angle focal length for Lenses

    Quote Originally Posted by The Hulk View Post
    Hi there folks. I need someone to explain what this means:
    "AF-S 50mm lens — a fast, single-focal-length lens with normal picture angle (when attached to a DX-format SLR, the picture angle is equivalent to a focal length of 75mm in FX/35mm format)"

    I own D300 & looking to buy this lens, but not really sure about the "picture angle equivalent to 75mm bit".

    Could a kind soul explain or point me in the right direction?

    Thx in advance.

    Cheers.
    I wrote something here.. http://www.clubsnap.com/forums/showthread.php?t=595669
    Post #43.

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