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Thread: [Question] Zoom magnification & Focal Length

  1. #1

    Default [Question] Zoom magnification & Focal Length

    Perhaps I overlook description but I came across this when I was comparing lenses...
    Both lenses were 18-200mm in focal length but one had a 5.6x zoom and the other 11.1x zoom... so heres my question, isnt focal length zoom if it isnt then whats the difference between focal length and zoom magnification... enlighten me please (:

  2. #2

    Default

    Quote Originally Posted by Marcusluvsgreen
    Perhaps I overlook description but I came across this when I was comparing lenses...
    Both lenses were 18-200mm in focal length but one had a 5.6x zoom and the other 11.1x zoom... so heres my question, isnt focal length zoom if it isnt then whats the difference between focal length and zoom magnification... enlighten me please (:
    18-200 is 11.1X zoom. The 5.6X is wrong. Are you sure you didn't mistake f3.5-5.6 as the zoom?

  3. #3

    Default Re: [Question] Zoom magnification & Focal Length

    to get the number of optical zoom, you just need to take the longest focal length and divide it by the shortest focal length, in this case 200mm/18mm = 11.1x zoom.

    12-24mm is 2x zoom, and 10-20mm is also a 2x zoom, etc.

  4. #4

    Default Re: [Question] Zoom magnification & Focal Length

    thanks guys for the clarification (: i misread the 2 one of which was 55-200 (3.6x) and the other 18-200 (11.1x)

  5. #5

    Default Re: [Question] Zoom magnification & Focal Length

    Do note that "Zoom" means nothing to photographers. It's purely a marketing term for the totally pointless consumer. After all, a 200mm-400mm is a "2x zoom", and a 10mm-20mm is also a "2x zoom".
    Alpha

  6. #6

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    Quote Originally Posted by Rashkae
    Do note that "Zoom" means nothing to photographers. It's purely a marketing term for the totally pointless consumer. After all, a 200mm-400mm is a "2x zoom", and a 10mm-20mm is also a "2x zoom".
    I used to be at a lost of all these "zoom" gimmicks in the past. Now I'm fully understand after going into DSLR.....

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