zoom lengths

Discussion in 'Photography Beginners' Forum' started by iknowdatalfabat, Jul 19, 2008.

  1. iknowdatalfabat

    iknowdatalfabat TPF Noob!

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    How do you know how far a zoom can reach?
    I used to think 70-300mm told you that but now i know that it's the focal angle.
     
  2. Rogan

    Rogan TPF Noob!

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    all 70-300's will reach the same distance
    same with any 17-50
    18-70 etc etc

    when your at 300mm not matter what 300mm lens you use you will be looking at the same picture (removing IQ etc etc)

    there isnt a way to say exactly how far you can reach depends on the subject really
     
  3. iknowdatalfabat

    iknowdatalfabat TPF Noob!

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    yeah but do 70-300s reach the same distance as 24-70s?
     
  4. Rogan

    Rogan TPF Noob!

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    no, a 24-70 zoomed in fully will reach the same distance as a 70-300 not zoomed in at all
     
  5. flygning

    flygning TPF Noob!

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    As I understand it, it also depends on the camera you are using-- if you use a 70-300mm lens on 2 different cameras, each with a different sensor size, it will affect how "zoomed" the picture looks at any given focal length. Please, however, correct me if I'm wrong (I'm still learning too).
     
  6. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    No. A 70-300 starts where a 24-70 ends.
     
  7. iknowdatalfabat

    iknowdatalfabat TPF Noob!

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    focal length AND zoom length?
     
  8. flygning

    flygning TPF Noob!

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    I think to calculate your actual zoom, you have to divide the largest focal length of the lens by the smallest. However, that won't actually tell you how "far" the lens will reach, just how much farther your largest focal length will reach than the smallest one does.
     
  9. iknowdatalfabat

    iknowdatalfabat TPF Noob!

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    sooo does that mean that 200/18=11.11 so the zoom is 11x magnification?
     
  10. Rogan

    Rogan TPF Noob!

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    yes your right about that

    and it does depend on your cameras sensor, a 70-300 will be differant on a canon dslr to a nikon dslr, to a 35mm camera
     
  11. iknowdatalfabat

    iknowdatalfabat TPF Noob!

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    I have a Nikon D40. So what does that mean for the zoom?
     
  12. Josh66

    Josh66 Been spending a lot of time on here!

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    I think that's what they would call an 11x zoom, but it's not actually 11x magnification.

    The long end is 11 times longer than the short end, but you're probably not going to be anywhere near 11x magnification. You will just have a smaller field of view.
     

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