Making background more sharp

Discussion in 'Photography Beginners' Forum' started by mortallis288, Sep 14, 2006.

  1. mortallis288

    mortallis288 TPF Noob!

    Joined:
    Sep 8, 2006
    Messages:
    303
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    i got the forground sharp and nice looking but how do i get the background like that? is it the f setting? here is a pic to show you what im talking about

    [​IMG]
     
  2. JDP

    JDP TPF Noob!

    Joined:
    Aug 16, 2006
    Messages:
    285
    Likes Received:
    0
    Location:
    Minneapolis, MN
    Can others edit my Photos:
    Photos OK to edit
    Yep. Smaller aperature = more depth of field.
     
  3. mortallis288

    mortallis288 TPF Noob!

    Joined:
    Sep 8, 2006
    Messages:
    303
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    ahh thanks that was at f5.6
     
  4. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

    Joined:
    Aug 25, 2003
    Messages:
    7,021
    Likes Received:
    34
    Location:
    Lawrence, KS
    Can others edit my Photos:
    Photos NOT OK to edit
    Depth of field (DOF) describes how much of the photo is in focus.

    To increase DOF (more in focus):
    decrease aperture size (higher numbered f/stops)
    decrease focal length (wide angle)
    decrease lens coverage (this is decided by camera choice)
    increase camera to subject distance (get farther away)

    To decrease DOF (less in focus):
    increase aperture size (lower numbered f/stops)
    increase focal length (tight angle)
    increase lens coverage
    decrease camera to subject distance (get closer)
     
  5. mortallis288

    mortallis288 TPF Noob!

    Joined:
    Sep 8, 2006
    Messages:
    303
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    decrease lens coverage (this is decided by camera choice)

    What do you mean by that?
    and if i decearse the apt to like f4 then it will be more in focus?
    it kinda sucks having film learning cause we havnt started dark room yet and i wanna try to learn some stuff before we start taking pictures for a grade.
     
  6. mysteryscribe

    mysteryscribe TPF Noob!

    Joined:
    Feb 1, 2006
    Messages:
    6,071
    Likes Received:
    3
    Location:
    in the middle of north carolina
    Can others edit my Photos:
    Photos OK to edit
    you have it backwards... You want an f11 f 16 for good depth of field. Macro is inherantly short depth of field so you have to really compensate for it.

    Try to shoot shots where the background is close to the subject if you want it sharp. A close up of a flower with a mountian miles about is not going to be in focus period. It just takes time to get it.

    Let me rephrase that I have a camera that will shoot f 500 it might do the flower up close and the mountain far away but most ordinary cameras wont do it.
     
  7. mortallis288

    mortallis288 TPF Noob!

    Joined:
    Sep 8, 2006
    Messages:
    303
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    thaks
     
  8. LWW

    LWW TPF Noob!

    Joined:
    Aug 3, 2005
    Messages:
    1,206
    Likes Received:
    2
    Location:
    Dayton,Ohio
    If you are learning I would suggest reshooting the pic at each available F stop you have and then compare the differences so you get a feel for how much each stop changes things.

    You can do the same thing with shutter speeds against moving objects.

    LWW
     
  9. Digital Matt

    Digital Matt alter ego: Analog Matt

    Joined:
    Jan 30, 2004
    Messages:
    5,346
    Likes Received:
    65
    Location:
    Santa Barbara, CA
    Can others edit my Photos:
    Photos NOT OK to edit
    Smaller film formats, and smaller digital chips, which have smaller lenses, will have inherently more depth of field. 35mm has more depth of field at a given aperture than does 120 film, and the same goes for 4x5 to 120.

    If you are taking a class, and shooting 35mm, don't worry about that. Understanding how aperture affects depth of field is the most important concept to grasp.
     
  10. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

    Joined:
    Aug 25, 2003
    Messages:
    7,021
    Likes Received:
    34
    Location:
    Lawrence, KS
    Can others edit my Photos:
    Photos NOT OK to edit
    Aperture is confusing because a lower f/#, such as f/2.8, is actually a large aperture, and a high f/#, like f/22, is a small aperture.

    focal length divided by aperture size = f/#

    so a 50mm lens at f/2 has an aperture size of 25mm

    a 50mm lens at f/10 has an aperture size of 5mm
     
  11. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

    Joined:
    Aug 25, 2003
    Messages:
    7,021
    Likes Received:
    34
    Location:
    Lawrence, KS
    Can others edit my Photos:
    Photos NOT OK to edit
    Aperture is the DOF controller most emphasized, but understanding how focal length and camera to subject distance affect DOF have lots of real world application too.

    The DOF of f/8 on a 28mm lens is huge, while at f/8 on a 200mm lens it's much smaller.

    The DOF of f/8 focused at 15' is measured in feet, but focused at 15" it will only be a few inches.
     
  12. mortallis288

    mortallis288 TPF Noob!

    Joined:
    Sep 8, 2006
    Messages:
    303
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    thanks for the help guys!! we are doing pin hole cameras right now in the class, so im just praticing and getting to know what different settings do
     

Share This Page