Sony SLT-A77VM - Manual (Page 140)

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Setting ISO
The camera automatically shoots multiple images continuously, combines
the images, reduces the noise, and records 1 image. In multi frame noise
reduction, you can select larger ISO numbers than the maximum ISO
sensitivity.
The image recorded is 1 combined image.
Notes
• When [Quality] is set to [RAW] or [RAW & JPEG], this function cannot be used.
• The flash, D-Range optimizer, and [Auto HDR] cannot be used.
Multi frame noise reduction