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Image Size
The size setting refers to the image resolution in pixels.
A higher image resolution allows you to print that image
in larger sizes without degrading the image quality.
The bigger the number of recorded pixels is, the
better the image quality becomes. As the number
of recorded pixels lessen, you will be able to record
more images on a memory card.
OIS
This mode can help reduce photo blur caused by
unintentional hand shake, low light .
Use this image stabilization mode in dark
environments.
Shooting in a windy or unstable environment (such
as a moving vehicle) may cause blurred images.