Exposure with Shutter Speed

Shutter Speed is one of the three pillars of photography, the other two being ISO and the Aperture.

Camera Shutter?

Simply put, a camera shutter is a curtain in front of the camera sensor that stays closed until the camera fires. When the camera fires, the shutter opens and fully exposes the camera sensor to the light that passes through the lens aperture. After the sensor is done collecting the light, the shutter closes immediately, stopping the light from hitting the sensor. The button that fires the camera is also called “shutter” or “shutter button”, because it triggers the shutter to open and close.


1 Lens
2 Reflex mirror
3 Shutter
4 Image sensor
5 Matte focusing screen
6 Condenser lens
7 Pentaprism
8 Eyepiece/Viewfinder

Shutter Speed?

This is a measurement of the time value it takes the Shutter to open and close when the light travels thru the lenses aperture to the sensor. the measurements are shown in values of fractions called Stops. 1/8000, 1/6400, 1/5000, 1/4000, 1/3200, 1/2500, 1/2000, 1/1600, 1/1250, 1/1000, 1/800, 1/640, 1/500, 1/400, 1/320, 1/250, 1/200, 1/160, 1/125, 1/100, 1/80, 1/60, 1/50, 1/40, 1/30, 1/25, 1/20, 1/15, 1/13, 1/10, 1/8, 1/6, 1/5, 1/4,  onward to include 30 seconds. The bigger the fraction as in 1/8000 the faster the shutter speed. Then if we set the shutter to 1/4 it is allot slower. Usually when we get a shutter speed down to 1/30 we need a tripod to hold the camera because that is when we experience Camera Shake. SO one rule I always go by if we hand hold the camera to shoot with, our SS should be set to at least equal or higher that our focal length of our lens so if our lens is a 70-200, what ever our lens is doomed in at then our SS hitter speed should be at least equal or higher. Lens = 70-200 and SS should be set to 1/80 or higher ( i usually set mine to 1/100 or higher), if lens focal length = 200 the set SS to 1/250 this will allow you to hand hold camera to shoot. Landscape photographers intentionally use slow shutter speeds to create a sense of motion on rivers and waterfalls, while keeping everything else in focus.

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