Samsung WB350F User Manual (en)

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Extended functions
  47
Aperture value
The aperture is a hole that lets light into the camera. The aperture housing contains 
thin, metal plates that open and close, widening or narrowing the aperture, and 
controlling the amount of light that enters the camera. The size of the aperture is 
closely related to the brightness of a photo: the larger the aperture, the brighter 
the photo; the smaller the aperture, the darker the photo. Note that the larger the 
aperture value, the smaller the aperture size. For example, an aperture set to 5.6 is 
larger than an aperture set to 11.
S  Small aperture value (The size of the 
aperture is large.)
S  Large aperture value (The size of the 
aperture is small.)
Shutter speed
Shutter speed, which is an important factor in the brightness of a photo, refers to 
the amount of time it takes to open and close the shutter. A slow shutter speed 
allows more time to let light in. All things being equal, photos are brighter, but fast 
moving objects tend to blur. On the other hand, a fast shutter speed allows less time 
to let light in. Photos are darker, but objects in motion are captured more clearly.
S  Slow shutter speed
S  Fast shutter speed
Using the Aperture Priority, Shutter Priority, or Manual mode
Adjust the aperture value or shutter speed to control the exposure of your photos. You can use these options in the Aperture Priority, Shutter Priority, and Manual modes.