aperture question

Discussion in 'Photography Beginners' Forum' started by blakklabelx, Jul 10, 2008.

  1. blakklabelx

    blakklabelx TPF Noob!

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    ok, so i know to use a low f-stop number for dark places, and a high f-stop number for lighter places, but what about dof? does this make it impossible to get a non-blurry night time landscape shot, because im using a low F number?
     
  2. Yahoozy

    Yahoozy TPF Noob!

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    it depends on what your shooting
    DoF is all about perspective, a low f-number combined with... say... shooting a close-up pencil on a table will provide a low depth of field, that is a small amount of the photo will be in focus
    but using a low f-number on... say... a whole street at night, where the goal is to have as much in focus as possible, will give you plenty of light while keeping everything in proper focus
    as a general rule, the less the distance all the grounds (foreground, middleground, background) of the photo are from each other the less it is effected by DoF
    if that makes sense hahah
    im not the greatest at explaining it =P
     
  3. djrichie28

    djrichie28 TPF Noob!

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    If you want a long DOF landscape night shot (fairly small aperture) then you are going to need to lengthen your exposure time to make up for the smaller amount of light entering the camera. Set up for a long shutter speed on a tripod. You can take a night shot at f32 providing you allow a longer exposure.
     
  4. Bifurcator

    Bifurcator TPF Noob!

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  5. someguy5

    someguy5 TPF Noob!

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    Distance from subjects increases depth of field.
     
  6. Helen B

    Helen B TPF Noob!

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    Bifurcator,

    An excellent illustration, but you might want to check your numbers.

    ISO 800 is three stops from ISO 100 (100, 200, 400, 800)

    F/8 is one stop from f/5.6 (see example 2) and f/16 is three stops from f/5.6 (see example 4)

    1/30 is three stops from 1/4 (see example 3).

    Best,
    Helen
     
  7. Bifurcator

    Bifurcator TPF Noob!

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    Good catch! I wasn't even thinking about it. I was just making up the numbers to convey the concept. :D You're right though, it looks funny if someone were to actually consider the examples. Thanks! (edited) :thumbup:

    http://tesselator.gpmod.com/Images/_Text/TPFBS.txt
     
    Last edited: Oct 21, 2008

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