Zoom

Discussion in 'Off-Topic' started by susannah, Jul 28, 2012.

  1. susannah

    Thread Starter Active Member

    Feb 14, 2010
    87
    0
    I saw small lenses for sale for CMOS camera modules.

    These are 2.1mm and 2.8mm lenses.

    Are these kind of zoom lenses or what these do? And how much zoom these add?
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
    1,153
    304
    Usually a single number such as 2.1mm indicates a fixed (non adjustable) lens. A lens marked 3-9 indicates it's 3 to 9 power adjustable(zoom) lens. I just used these numbers as examples, they could be any number.
     
  3. maxpower097

    Well-Known Member

    Feb 20, 2009
    795
    388
    Chances are they are for wide angle, or narrowing angle for small cmos camera's.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    The subject on lenses can be quite deep, it is one of the big bucks items professional photographers have to pay for.
     
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