Sony DSLR-A100 - Manual (Page 66)

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z Shooting techniques
While shooting images, the camera automatically determines the exposure. When shooting a whitish
overall image such as a backlit subject or a snowy scene, the camera judges that the subject is bright and
may set a darker exposure for the image. In such cases, adjustment of the exposure in the + plus direction
is effective.
When shooting a darker overall image, the camera judges that the subject is dark and may set a brighter
exposure for the image. In such cases, adjustment of the exposure in the – minus direction is effective.
You can try to adjust the exposure to suit your taste.
Adjust in the + direction
Adjust in the – direction