Sony DSLR-A100 - Manual (Page 85)

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For details on the operation 1 page 80
Long exposure makes noise conspicuous. When the shutter speed is one second or slower,
noise reduction is activated to reduce the grainy noise that is common in long exposures.
• Noise reduction is not performed on continuous shooting or continuous bracketing regardless of this
setting.
The focus is confirmed when you look into the viewfinder, and the shutter speed and aperture
are adjusted automatically.
Noise reductn
On When a long exposure of one second or longer takes place,
the noise reduction process is performed for the duration that
the shutter was open. While the noise reduction is being
performed, the message “Processing...” appears on the LCD
monitor. You cannot take the next picture until the process is
over.
Off This mode does not perform noise reduction. This is suitable
when timing of shooting takes precedence. However, this
makes the noise more conspicuous. It is recommended that
you activate the noise reduction if you use long exposure.
Eye-Start AF
On Automatically adjusts the focus.
• This mode uses up the battery charge faster than [Off].
Off Does not adjust the focus.