Sony DSLR-A850 - Manual (Page 88)

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When you want to activate only the Optical preview function
Set [Preview Function] to [Optical Preview] in the
Custom menu
(page 114).
Notes
• The image in the viewfinder will be darker during the Optical preview.
• The auto focus does not function during an Optical preview. Focus on the subject
beforehand.
• The Intelligent preview feature cannot be used during BULB shooting.
• The Intelligent preview feature cannot be used when the buffer memory of the
camera is full.