Sony DSLR-A850 - Manual (Page 110)

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In the default setting, adjusting the focus is carried out by pressing the
shutter button halfway down. You can deactivate this action.
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.
Note
• Noise reduction is not performed on continuous shooting or continuous bracket even
when it is set to [On].
When shooting with the ISO set at 1600 or above, the camera reduces the
noise that becomes more noticeable when the camera sensitivity is high.
Note
• The speed of continuous shooting becomes slower when set to [High].
AF w/ shutter
On Adjusts the focus by pressing the shutter button halfway
down.
Off Does not adjust the focus by pressing the shutter button
halfway down. You can adjust the focus by pressing the
center of the multi-selector. This is convenient when shooting
continuously at the same focus position.
Long exp.NR
On When the shutter speed is one second or slower, the noise
reduction process is performed for the duration that the
shutter was open. You cannot take the next picture until the
process is over. This is suitable when the image quality takes
precedence.
Off This mode does not perform noise reduction. This is suitable
when timing of shooting takes precedence.
High ISO NR
High When [High] is selected, the noise reduction works more
effectively. When you give priority to the details of a subject,
select [Low].
Normal
Low
Off Does not reduce noise.