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Anonymous asked in Arts & HumanitiesVisual ArtsPhotography · 2 months ago

when using a low iso do you need a slow shutter speed?

9 Answers

  • 1 month ago

    why low not possible.

  • 1 month ago

    It is all about current light situation.

  • 1 month ago

    All else is equal, low-speed films would need longer exposure to achieve the same degree of exposure as high-speed films, not the other films.

  • ?
    Lv 7
    1 month ago

    only if you want to keep the same amount of light to fall on the film / sensor

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  • Rita
    Lv 6
    1 month ago

    If you are photographing a moving subject, like a waterfall, and wish capture a lovely silky effect in the water, you will need to use a slow shutter speed. This is easier to do when your ISO setting is low. ISO 50 on a bright day to set the shutter speed slow enough to capture motion blur in the water.

  • Sumi
    Lv 7
    2 months ago

    A lower ISO means that the sensor's sensitivity or the film's sensitivity to light is reduced.  If, and only if, the aperture is the same, a lower ISO must produce a longer shutter speed.  If you can open the aperture the same number of stops that the ISO is reduced, then the shutter speed will not need to be changed.

  • keerok
    Lv 7
    2 months ago

    No, but if you want to maintain aperture size and you set ISO down, you will need to set shutter speed longer to maintain exposure level given the same amount of light.

    If you set ISO low first then tinker with the other settings next then adjust shutter speed to what you need and trust the lightmeter when setting aperture size.

  • qrk
    Lv 7
    2 months ago

    The general answer is NO.

    When changing ISO, you have a choice of adjusting shutter speed or aperture.

    If changing shutter speed, you will use a slower shutter speed.

    If changing aperture, you will use a wider aperture (lower f-number).

  • 2 months ago

    No, but the slower film (low ISO) generally needs longer exposure (slower shutter speed) to get the same level of exposure as a faster (higher ISO) film, everything else being the same.

    Most good cameras have a light meter that tells you what your exposure level would be for the given ISO, and you can adjust the F-Stop (aperture, or wideness of the opening) and shutter speed to get a total light exposure that is expected for the film.  If the camera does not have one, then you have to have one of your own that is separate, if you want to do more than point-and-shoot photography

    The basic idea is that ISO is a measure of the average total light that is needed to make the film react to an ideal amount (to get the best picture).  Lower ISO ("slow" film) needs more light, so you can get that either through longer exposure time, or wider aperture, or really a bit of both.

    Longer exposure (slower shutter) allows movement of objects to get captured and "smeared".  Shorter exposure (faster shutter) gives a sharper image.  Aperture affects depth of field.  Smaller apertures give photos that have a better feeling of distance between foreground and background.  Wider aperture tends to give a "flat" photo so are better for portrait photos, say.

    Choosing film speed is part of the game you can play with photography.  Slower films tend to have a higher density of grains that can react to light, so can make a more detailed picture.  Kind of like a high pixel density, high pixel density needs more total light, as a general idea.  So, you can play between graininess, sharpness, and depth of field using the three inputs of film speed, shutter speed, and aperture.

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