Sony ILCE-7 How To Use Manual page 116

When you set the shutter speed to one second or longer (long exposure shooting), noise
reduction is turned on for the duration that the shutter is open. With the function turned on, the
grainy noise typical of long exposures is reduced.
1. MENU →
Menu item details
On (default setting):
Activates noise reduction for the same duration that the shutter is open. When noise reduction
is in progress, a message appears and you cannot take another picture. Select this to prioritize
the image quality.
Off:
Does not activate noise reduction. Select this to prioritize the timing of shooting.
[127] Using shooting functions > Setting the other
functions of this product
High ISO NR (still image)
When shooting with high ISO sensitivity, the product reduces noise that becomes more
noticeable when the product sensitivity is high. A message may be displayed during noise
reduction processing; you cannot shoot another image until the message disappears.
1. MENU →
Menu item details
Normal (default setting):
Activates high ISO noise reduction normally.
Low:
Activates high ISO noise reduction moderately. Select this to prioritize the timing of shooting.
Off:
Does not activate high ISO noise reduction.
[128] Using shooting functions > Setting the other
(Camera Settings) → [
(Camera Settings) → [
Long Exposure NR] → desired setting.
High ISO NR] → desired setting.