aperture and viewfinder

Discussion in 'Photography Beginners' Forum' started by Tighearnach, Feb 5, 2009.

  1. Tighearnach

    Tighearnach TPF Noob!

    Joined:
    Oct 26, 2007
    Messages:
    224
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    hi

    So I'm taking a picture with a 50mm f/1.8 and it's set to f/22. I look through the viewfinder and compose and then half press shutter. The lens focuses. Am I looking at the image at f/22 or at the lens maximum aperture?

    Sorry just a bit confused
    Thanks
    T
     
  2. Samanax

    Samanax TPF Noob!

    Joined:
    Jan 1, 2009
    Messages:
    2,562
    Likes Received:
    0
    Location:
    Kaneohe, Oahu
    Can others edit my Photos:
    Photos OK to edit
    At maximum aperture. To view the image at f/22 you have to use the depth of field preview button (see the camera manual for location)...the viewfinder image will darken quite a bit at f/22.
     
  3. Big Mike

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

    Joined:
    Dec 16, 2003
    Messages:
    33,822
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    You are still looking though the lens at maximum aperture (F1.8 )
    The aperture does not stop down until you press the shutter release button.

    Now, some cameras have a DOF preview button. This button stops down the aperture to the set value so that you can see the increased DOF. However, because the aperture gets smaller, it lets in less light and it's harder to see the image. At F22...the viewfinder image would be very dark.

    This is how most modern SLR cameras work anyway...if you have something different, this might not be the case.
     
  4. Tighearnach

    Tighearnach TPF Noob!

    Joined:
    Oct 26, 2007
    Messages:
    224
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    ok. Can't believe I'm only copping this now. So this means that when not shooting at max ap a certain amount of guesswork is involved as to how final image will look? This obviously is reduced with experimce
    Thanks
     
  5. Big Mike

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

    Joined:
    Dec 16, 2003
    Messages:
    33,822
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    When it comes to DOF....yes. However, DOF can be calculated if you want to be precise about it.

    Realistically, the viewfinders on most DSLR cameras are quite tiny and it's rather hard to really see your DOF with the preview. You do get a good feel for it with experience and you can always bracket a few shots to be safe.
     
  6. Tighearnach

    Tighearnach TPF Noob!

    Joined:
    Oct 26, 2007
    Messages:
    224
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    thanks. Confusion has evaporated for now...
     

Share This Page