What aperture setting is best for avoiding motion blur?

6 Answers

  • ?
    Lv 7
    2 months ago
    Favorite Answer

    If you're not sure as to how fast of shutter speed you need to stop motion blur, simply use the largest aperture that your lens has.  This is typically f/4~f/5.6 on most consumer-grade lenses. Beginners get this confused with f/stops like f/16 and f/22 which are among the smallest lens openings.  F/stops are fractions, so f/2 > f/16.

    The speed of the subject within the viewfinder (apparent speed will increase as focal length increases), dictates the shutter speed required to stop motion.  Someone walking may only need 1/125th to stop their motion (1/60th if using a wide-angle lens).  Someone running will likely need 1/500~1/1,000th if zoomed in or about 1/250th~1/500th with a wide lens.  Swinging of a baseball bat will need at least 1/1,500~2,500th depending on the player and if you also want to stop the ball, too.

    What causes motion blur is that the subject is moving too fast from the perspective of the film/sensor.  So if you have something moving and you pan the camera exactly with the movement of the subject, from the camera's perspective, the subject is not moving but everything stationary is moving.  This is how you get race car images where the car is frozen but the ground and background is blurred. 

    To prevent motion blur, use a shutter speed that is fast enough to prevent it.  What you find is that in order to use a fast shutter speed you need to have more light entering the camera due to the short exposure times.  Therefore, as you increase the size of the aperture allowing in more light, you shutter speeds will always increase (i.e. shorter times). If your aperture is already at maximum, then you must either use a different lens with a larger aperture or you could use a flash.  However, the subject must be within the working range of the flash, so stopping an athlete is usually out of the question.

    With this in mind, if you set your camera to aperture priority and choose the largest f/stop (which is the smallest number such as f/2.8), you are now allowing the most amount of light into the camera thus forcing the camera to use the fastest shutter speed possible based upon your ISO setting and the brightness of the scene providing you've metered the scene properly.

    A flash can be used to stop motion, but only in low-light situations where the only light being recorded by the film/sensor is the light coming from the flash.  Since the duration of a flash's output is roughly 1/5,000th, it can pretty much stop any kind of motion blur since, from the camera's perspective, the exposure time is equal to the duration of the flash's output.  It doesn't matter if your actual shutter speed is one second, just as long as no ambient light is being recorded, the motion will be perfectly stopped.

  • ?
    Lv 6
    2 months ago

    Blurred imaged due to subject/camera motion:

    When imagining landscapes and stationary subjects, likely the minimum shutter setting is 1/60 of a second. If the shutter is set to slower, like 1/30 or 1/15, it is very likely that camera shake with be the despoiler.

    To freeze runners you will need a shutter setting of 1/500 or 1/1000. For slower moving subjects, 1/250 works. A shutter setting of 1/125 works for panning. Panning is a technique whereby the camera is smoothly moved so that it keeps pace with the principal subject. This procedure freezes a fast moving airplane or race horse, however the background will image blurry. This trick requires a smooth swinging motion maintained as the shutter is pressed. Panning gives the still photograph a sensation of speed.

    As to a specific shutter speed for the countless possibilities of subject motion, this is an acquired skill based on experience. As an example, a runner crossing your path requires a higher shutter speed as opposed to a person running directly toward or away from your position. All that can be said, the faster the subject moves, the higher the shutter speed.

    Aperture plays in this reckoning: The shot will be worthless if the exposure setting is off. Exposure intertwines shutter speed, aperture setting, ISO setting, and surrounding light brightness. If we choose a fast shutter, the time allowed for the imaging chip (or film) to record an image is brief. Likely the picture will be severely under-exposed unless action is taken. We are talking, setting the lens to a more wide-open aperture. Maybe we will need to up the ISO setting ((light sensitivity of image sensor), in an effort to compensate for a super-fast shutter.

    Don’t fret! Modern cameras are loaded with computer logic. The “auto” mode or “sports” mode will make these several adjustments for you. The trick is to understand how these setting all intertwine so that you can be the master and make these setting for yourself. This will be an acquired skill. Only study and practice overcomes this learning curve.

  • 2 months ago

    Aperature plays no part in motion blur. The shutter speed is what allows or prevents motion blur. The slower the shutter speed the more blur. And vice versa.

    Source(s): Experience as a professional wedding & portrait photographer.
  • 2 months ago

    i doesn't matter

    the speed of the shutter is important, the aperture setting will be derived by the ISO and light levels

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  • keerok
    Lv 7
    2 months ago

    Blur is primarily a shutter speed concern. The faster the shutter speed, the less chances of blur. 

    Aperture size has an inverse relation to shutter speed. The larger the aperture size (lower f/number), the faster you can set shutter speed (bigger denominator). To get the fastest possible shutter speed then, set aperture to the lowest available f/number. 

    If blur still happens, increase ISO little by little until such point where blur is minimized and grain/noise is acceptable.

  • qrk
    Lv 7
    2 months ago

    Use shutter speed to minimize motion blur.

    Use aperture to control depth of field.

    You may end up using a wider aperture (lower f-number) to allow you to shoot at a higher shutter speed, but this depends on lighting, ISO setting, and what sort of depth of field you are trying to achieve.

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