lenses

Discussion in 'Photography Beginners' Forum' started by vagelism22678, Jan 25, 2010.

  1. vagelism22678

    vagelism22678 TPF Noob!

    Joined:
    Jan 24, 2010
    Messages:
    2
    Likes Received:
    0
    Location:
    Greece
    Can others edit my Photos:
    Photos NOT OK to edit
    Hello to all.
    I am totally newbie to photography. I would like to ask what these numbers on lenses mean? For example 55X100 and so on!
    What is the most appropriate lens for each kind of work?
    Thank you all for your time.
    Regards
    Vangelis.
     
  2. AG74683

    AG74683 TPF Noob!

    Joined:
    Jan 9, 2010
    Messages:
    138
    Likes Received:
    0
    Location:
    Hickory/Boone, NC
    Can others edit my Photos:
    Photos OK to edit
  3. KmH

    KmH Helping photographers learn to fish Supporting Member

    Joined:
    Apr 9, 2009
    Messages:
    38,229
    Likes Received:
    5,003
    Location:
    Iowa
    Can others edit my Photos:
    Photos OK to edit
    Here are some Nikon lens examples:


    AF 50 mm f/1.8D
    • AF means Auto Focus (if the camera body it's attached to has an auto focus motor. Entry level Nikon's don't have a focus motor.)
    • 50 mm is the focal length. This lens is not a zoom lens. It's is known as a "prime" lens.
    • f/1.8 describes the largest aperture the lens can be opened to.
    • D is a designation Nikon uses to let the buyer know the lens transmits distance information to the cameras microprocessor.
    • Aperture, or the size of the lens opening, is just one of the triad of adjustment that control an exposure. Shutter speed and ISO are the other 2 parts of the exposure triad.
    AF-S 18-55 mm f/3.5-5.6G
    • AF-S means Auto Focus - using a Silent Wave Motor that is in the lens. (Can be used on all Nikon's made today.
    • 18-55 mm mean the focal length of the lens can be changed by the user. Also known as a 'zoom' lens.
    • f/3.5-5.6 means this lens has a variable aperture. When the lens is at 18mm the maximum aperture you can use is f/3.5. When zoomed to 55 mm the maximum aperture you can use is f/5.6. This change in maximum aperture is a mechanical attribute of the internal design of the lens. If the lens is set to maximum aperture when at 18mm the lens automatically adjusts the aperture to a progressively smaller lens opening. So at 30 mm the aperture may be at f/4.
    • G is Nikon's designation that means the lens does not have a manually adjustable aperture ring. Aperture can only be adjusted by the camera.
    AF-S 70-200mm f/2.8G
    • AF-S is as before
    • 70-200 mm as before indicates this is a zoom lens.
    • f/2.8 indicates this is a constant aperture zoom lens. F/2.8 can be used at both 70 mm and 200 mm. The constant aperture capability significantly increases the production and purchase costs for this type of lens.
    • G is as before.
     
  4. JimKing

    JimKing TPF Noob!

    Joined:
    Dec 21, 2008
    Messages:
    36
    Likes Received:
    0
    Location:
    Salisbury MD
    Can others edit my Photos:
    Photos NOT OK to edit
    I've been shooting since 1958 and now I teach a few photography classes at a local community college and I have never seen a "55X100" designation. I noticed you were from Greece and thought it must be a European style and then the answer came from North Carolina not too far south of my Maryland location. It's great to learn new stuff!
     
  5. fokker

    fokker No longer a newbie, moving up!

    Joined:
    Jun 23, 2009
    Messages:
    2,830
    Likes Received:
    293
    Location:
    New Zealand
    Can others edit my Photos:
    Photos OK to edit
    You also might see numbers like 58mm or 67mm on the front, which indicate the diameter of filter thread you need to use for any filters you attach to that lens.
     
  6. AG74683

    AG74683 TPF Noob!

    Joined:
    Jan 9, 2010
    Messages:
    138
    Likes Received:
    0
    Location:
    Hickory/Boone, NC
    Can others edit my Photos:
    Photos OK to edit
    :lol:

    I was just guessing, but I believe thats what he is talking about.
     
  7. kundalini

    kundalini Been spending a lot of time on here!

    Joined:
    Jul 18, 2007
    Messages:
    13,601
    Likes Received:
    1,929
    Location:
    State of Confusion
    Can others edit my Photos:
    Photos NOT OK to edit
    I agree that a designation of 55X100 seems to be a zoom focal length, but in the same breath, seems a bit of an odd FL for Nikon. While the useage of 55X100 seems very European, the fact it's metric is no suprise. (Why, of why didn't we go metric back in the 60's as promised?)

    IMO, the more important number is the aperture. A constant f/2.8 is much more meaningful than the focal length (FL) for zoom lenses.
     
  8. E-Stew

    E-Stew TPF Noob!

    Joined:
    Jan 21, 2010
    Messages:
    14
    Likes Received:
    0
    Location:
    NW FL
    Can others edit my Photos:
    Photos NOT OK to edit
    Thanks...surfing around pays off here.
     
  9. vagelism22678

    vagelism22678 TPF Noob!

    Joined:
    Jan 24, 2010
    Messages:
    2
    Likes Received:
    0
    Location:
    Greece
    Can others edit my Photos:
    Photos NOT OK to edit
    No Sir.
    It was just and example ... I do not know if it exists 55X100!
    Thank you
     

Share This Page