EOS f stop question

Discussion in 'Photography Beginners' Forum' started by RegRoy, Jul 5, 2010.

  1. RegRoy

    RegRoy TPF Noob!

    Joined:
    Jul 3, 2010
    Messages:
    74
    Likes Received:
    0
    Can others edit my Photos:
    Photos NOT OK to edit
    So I'm playing with aperture and I took 4 photos with the EOS set on manual aperture so I can learn how aperture affects the pictures. Each time I took one of the 4 photos, I increase the aperture.

    I then brought the pictures into picasa so I can look at the data and compare the pictures.

    I get this for the 4 photos:

    f/3.5
    f/5.0
    f/16.0
    f/22.0

    But if I look at my lens (which is the one that came with the camera) it says:

    200mm EF-S 18-55mm 1:3.5 5.6

    So if the aperture of this lens stops at 5.6, how did I get the camera to take a picture at an aperture of 22.0?

    Sorry if this is so basic.

    Thanks.
     
  2. ghpham

    ghpham TPF Noob!

    Joined:
    Dec 16, 2007
    Messages:
    535
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    f/3.5 is the maximum aperture at 18mm; f/5.6 is the maximum aperture at 55mm. f/22 is the minimum aperture for all focal lengths.
     
  3. Flash Harry

    Flash Harry TPF Noob!

    Joined:
    Jun 26, 2006
    Messages:
    1,918
    Likes Received:
    1
    Location:
    Durham, UK
    Can others edit my Photos:
    Photos NOT OK to edit
    closing down, (F stops) the lens gives greater depth in a photo but also slows down shutter speed, opening reduces depth and shutter speeds become faster, 3.5-5.6 is the maximum aperture between the short and long end of the zoom. H
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,817
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    :thumbup:
     
  5. KmH

    KmH Helping photographers learn to fish Supporting Member

    Joined:
    Apr 9, 2009
    Messages:
    38,204
    Likes Received:
    4,999
    Location:
    Iowa
    Can others edit my Photos:
    Photos OK to edit
    Very direct, and right on point. :thumbup:
     
  6. RegRoy

    RegRoy TPF Noob!

    Joined:
    Jul 3, 2010
    Messages:
    74
    Likes Received:
    0
    Can others edit my Photos:
    Photos NOT OK to edit
    Gotcha! Thank you!
     

Share This Page