lens question

Discussion in 'Beyond the Basics' started by hammerhead_05, Oct 2, 2007.

  1. hammerhead_05

    hammerhead_05 TPF Noob!

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    god im retarded...i have yet another question regarding lenses. If a lens says 1.8 85mm. Does that mean that there will be no adjustible zoom? Just a focuser.
    |Brock|
     
  2. jon_k

    jon_k TPF Noob!

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    Correct.

    It's f/1.8 -- 85mm.

    This means it has a fixed focal length (e.g. no 'zooming' action) This type of lens is called a prime.
     
  3. Patrice

    Patrice No longer a newbie, moving up!

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    A lens of fixed focal lenght is ususally called a prime lens. So the lens you are referring to is a prime with a focal lenght of 85mm. In addition to the focus ring it will have a ring to adjust the apperture. The 1.8 means the widest apperture of that lens is f1.8. A minimum apperture for the same lens might be f16 or f22.
     
  4. Patrice

    Patrice No longer a newbie, moving up!

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    jon K

    You type faster than me, lol.
     
  5. hammerhead_05

    hammerhead_05 TPF Noob!

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    ah.....thanx ;)
     
  6. Sideburns

    Sideburns TPF Noob!

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    Prime lenses are known for being the highest quality optics for the price. I really like prime lenses, and I almost forget that I can't zoom when I'm using my 50mm, because you just adjust what pictures you're gonna take. Primes are good if you know what you're taking pictures of, because you can get a quality lens for less, and you won't be left without zoom when you need it.
     

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