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Digital SLR Zoom

  • 15-07-2005 3:54pm
    #1
    jabaroon
    Registered Users, Registered Users 2 Posts: 668 ✭✭✭


    Hi All,

    Am fairly sure this isn't the ideal place to ask this question, but I did look and couldnt find anywhere that seemed more suitable!...

    Anyway, does anyone know how you equate the mm values on an SLR lens with a zoom factor.

    For example, if a lens is 70-300mm, how do you calculate (or approximate) the equivalent zoom factor that the 300mm gets you?

    Thanks,
    Jab


Comments

  • #2
    Oriel
    Banned (with Prison Access) Posts: 5,154 ✭✭✭Oriel


    It's all relational.
    Say the lens is 30mm-300mm, then it's a 10x zoom. 300/30 = ten.
    Same applys for 37mm-370mm.

    So a 35mm-70mm lens has a 2x capability.
    The higher the number, the more powerful the zoom.

    At least I think that's right...

    S.


  • #3
    CuLT
    Subscribers Posts: 9,716 ✭✭✭CuLT


    moved to Art/Anim/Photo.


  • #4
    jabaroon
    Registered Users, Registered Users 2 Posts: 668 ✭✭✭jabaroon


    I though the bigger the second number, the larger the zoom?....however, I dont know how to calculate it ?!?!?....

    For example, a friend told me that is 70-300mm is about a 10x zoom. He was only able to tell me this based on his experience of using the lens...he did not know the more precise calc!


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