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Thread: Why Large Aperture?

  1. #1
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    Default Why Large Aperture?

    Hi,

    I had noticed that those lens come with larger aperture tent to be more expensive, does larger aperture give more sharpness for portrait shooting?

  2. #2

    Default Re: Why Large Aperture?

    A larger aperture allows you to shoot more with available light and thus such lenses are called "fast" lenses. Larger aperture = more glass and thus more expensive.

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    Default Re: Why Large Aperture?

    Sharper, no.
    It lets in more light if you're shooting in dim lighting conditions.
    With that you could shoot at a faster shutter speed to reduce camera shake while handholding.
    And it also helps to blur the background even more.

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    Default Re: Why Large Aperture?

    Quote Originally Posted by erizai
    Hi,

    I had noticed that those lens come with larger aperture tent to be more expensive, does larger aperture give more sharpness for portrait shooting?

    Faster... n exceptional "Bokeh" bro...

  5. #5

    Default Re: Why Large Aperture?

    Quote Originally Posted by hazta
    Faster... n exceptional "Bokeh" bro...
    Hmmm, the "bokeh" depends on the construction of the lens, e.g. aperture blades etc., some lenses like the Canon 50mm f/1.8, although it gives you a large aperture, the bokeh is a bit choppy.

  6. #6
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    Default Re: Why Large Aperture?

    i've given a explaination on why fast lenses are more expensive in an earlier thread.
    http://forums.clubsnap.org/showpost....44&postcount=9

    The real appeal (headache) for lense manufacturers is not what focal length ranges can one provide, it is the max. aperture the prime/zoom can provide to recreate an accurate image. Race drivers go for fast cars, we go for fast lenses. It is not about if this large aperture is better for shooting what, but for purely the fact it is fast and has ability to recreate gd/accurate images. For that, it is more expensive.

  7. #7
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    Default Re: Why Large Aperture?

    Quote Originally Posted by MyNikon
    Sharper, no.
    It lets in more light if you're shooting in dim lighting conditions.
    With that you could shoot at a faster shutter speed to reduce camera shake while handholding.
    And it also helps to blur the background even more.
    How it make the background even blur? does it affect the foreground sharpness?

  8. #8

    Default Re: Why Large Aperture?

    Quote Originally Posted by erizai
    How it make the background even blur? does it affect the foreground sharpness?
    You use large apertures (small aperture number) to create what we call a shallow depth of field. Your subject in focus will be isolated from the background.

    To a certain extent, a large aperture works well for portraits because it isolates the subject from the background. It also allows the photograph to select the background that produces pleasing effects when blurred.

    However, at more extremely apertures, such as F1 - F1.8, the DOF may be so narrow that some parts of your subject may be out of focus. For instead, taking an angled side profile, you might get half of the face in focus, while the other half out of focus because of the shallow DOF.

    Manipulation of the DOF also allows the photographer to decide on the textures of certain surfaces of the subjects. For example, a coarse textured surface when OOF will look smoother, when using large apertures (reverse holds true).

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    Default Re: Why Large Aperture?

    to let more light in, this is turn allows

    faster shutter speed
    shallow DOF

    fater shutter speed = can shoot without the use of tripod in low light situations
    freeze motion
    faster fps

    shallow DOF = isolation of subject from the bg
    selective focusing composition
    OOF a busy/messy bg

  10. #10

    Default Re: Why Large Aperture?

    Quote Originally Posted by ortega
    to let more light in, this is turn allows

    faster shutter speed
    shallow DOF

    Why faster shutter speed results in shallow DoF? Can enlighten?

  11. #11
    Senior Member +evenstar's Avatar
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    Default Re: Why Large Aperture?

    Quote Originally Posted by Sun_Of_The_Beach
    Why faster shutter speed results in shallow DoF? Can enlighten?
    This is because in order to get faster shutter speeds, you have to open up the lens ( aka larger aperture), hence allowing more light to enter. This results in a shallower DOF.
    eat. drink. shoot

  12. #12

    Default Re: Why Large Aperture?

    Quote Originally Posted by +evenstar
    This is because in order to get faster shutter speeds, you have to open up the lens ( aka larger aperture), hence allowing more light to enter. This results in a shallower DOF.
    Thanks! understand nw.

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    Default Re: Why Large Aperture?

    Quote Originally Posted by Sun_Of_The_Beach
    Why faster shutter speed results in shallow DoF? Can enlighten?
    use large aperture to get faster shutter speed

    use large aperture to shallow dof

    use of faster shutter speed does not give you shallow dof

    e.g fast shutter speed with small aperture.

  14. #14
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    Default Re: Why Large Aperture?

    Expensive 'fast' lenses are well made and use excellent glass, in order to achieve the large and often constant max aperature. This does result in greater sharpness and quality at other aperture settings.

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    Default Re: Why Large Aperture?

    sorry, abit confused with the setting on camera and lens.

    on lens, we have something like f4-f5.8, but we can also set aperture on the camera itself like f22 etc..

    what is the difference?

  16. #16

    Default Re: Why Large Aperture?

    Think the f4-f5.8 are the minimum f stops it has when using the lens from its lowest to highest focal length...so i think a 18-55mm f3.5-5.6 woul dmean at 18mm minimum aperture is 3.5 and at 55mm will be 5.6 am i right? HEE

  17. #17
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    Default Re: Why Large Aperture?

    yup. and u can go up to F22 or even smaller apertures depending on lens.

  18. #18

    Default Re: Why Large Aperture?

    Quote Originally Posted by xtac
    Think the f4-f5.8 are the minimum f stops it has when using the lens from its lowest to highest focal length...so i think a 18-55mm f3.5-5.6 woul dmean at 18mm minimum aperture is 3.5 and at 55mm will be 5.6 am i right? HEE
    I think you meant largest aperture , haha yeah you got it correct.

  19. #19
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    Default Re: Why Large Aperture?

    Does Larger aperture means faster lens?

    Better performance in Night time photography (or Low Light)?

    Does it also cut down noise level comparing to the smaller aperture lens?

  20. #20
    Senior Member +evenstar's Avatar
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    Default Re: Why Large Aperture?

    Quote Originally Posted by erizai
    Does Larger aperture means faster lens?

    Better performance in Night time photography (or Low Light)?

    Does it also cut down noise level comparing to the smaller aperture lens?
    People refer to fast lens as lens that are f1.0, f1.2, f1.4, f1.8, f2.8..

    It'll be less stressful for your flash as u need less flash output if shooting wide open in indoor or night time.

    Noise level is up to the camera's sensor, not the lens
    eat. drink. shoot

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