fast-and-slow-shutter-speed

The next important factor to be considered while trying to achieve a perfect exposure in digital photography is shutter speed. Like I mentioned earlier, the other two are Aperture and ISO. Firstly, we’ll give a brief introduction to what the shutter is in a DSLR camera, what it comprises of, how it works before we finally go into discussing shutter speed and features associated with it.

What is a shutter in a DSLR camera?

In photography, a shutter is a device that allows light to pass for a pre-determined period, exposing photographic film or a light-sensitive electronic sensor to light in order to capture a permanent image of a scene. The shutter is constructed such that it automatically closes after a certain required time interval. Operation of the shutter is triggered by a button called the shutter button or shutter-release button.

What is a shutter button?

In photography, the shutter button or shutter-release button is a button located mostly on the right-hand side of the DSLR camera body. When the button is pushed, the shutter opens for a pre-defined length of time; allowing light into the image sensor. During this process, an image is captured and the shutter closes afterward.

How does the shutter work in a DSLR camera?

Looking at a typical DSLR camera, the shutter comprises of 3 primary mechanisms; namely the mirror box, the bottom door and the top door. When the shutter button is pressed, the reflex mirror is tilted backward allowing light further into the camera. When the mirror flips upwards/tilts backward, a small door slides open from top to bottom, exposing the image sensor beneath. After that, another door slides down, covering the entire sensor. This process usually varies in time depending on the length of your exposure (shutter speed). After the second door closes, your reflex mirror falls back into place. The doors would then assume their default positions and technically, this process is known as Actuation. A typical DSLR camera can withstand close to 100,000 actuations in its lifetime.

shutter speed-How the shutter operates

How the shutter operates courtesy premiumbeat.com

What is shutter speed?

In Photography, shutter speed or exposure time is defined as the length of time the shutter remains open allowing light to get to the image sensor; also allowing the camera to take a photograph.

Features associated with shutter speed.

  • Shutter speed controls exposure – It is used to control the brightness of an image. The longer the shutter speed, the brighter the image. This is possible because the shutter is open for a considerable length of time to allow the image sensor to gather more light.
  • Shutter speed is measured in seconds – This could be full seconds (i.e 1 second, 5 seconds, 10 seconds etc) or fractions of a second (i.e 1/500, 1/250, 1/125, 1/60, 1/30, 1/15, 1/8 etc). The larger the denominator, the faster the shutter speed; the lower the denominator the slower the shutter speed. for example; 1/500 is faster than 1/30.
  • Shutter speed is used to freeze movement in an image – By using a very fast shutter speed, motion is frozen. For example, using the featured image above, the image taken at 1/1000 sec freezes motion.
  • Shutter speed is used to capture motion in an image – By using a very slow shutter speed, motion is captured. For example, using the featured image above, the image taken at 1/80 sec captures motion.
  • Shutter speed and focal length – As a rule of thumb, always use shutter speeds with a denominator greater than the focal length. This helps to prevent camera shake especially in situations where image stabilization is absent

Conclusion

So while making things as simple as possible, we’ve been able to analyze the shutter speed as regards to digital photography and how it plays a significant role to achieve a perfect exposure while capturing an image. We have looked at Aperture, Shutter speed, next would be ISO.

Kindly share your thoughts in the comment section below.

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Digital Content Creator at ForteSpy Productions
Nigerian Wedding, Beauty, Portraits And Fashion Photographer | Cinematographer | 3D Animator | Motion Graphic Artist | Graphic And Web Designer
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2 Comments
  1. […] role in capturing a perfectly exposed image. The first we discussed was Aperture, next we looked at Shutter Speed, and now we’ll be looking at ISO as it relates to Exposure in Digital […]

  2. […] factors that determine exposure in photography; which is Aperture. The other two are ISO and Shutter speed. Before we go ahead, it’s advisable we have a good knowledge of the structure of a DSLR […]

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