Sony a (alpha) slt-a33 User Manual

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To check blurring of the background (Preview button)
• Press the preview button after you adjust the focus.
• You can adjust the aperture in preview mode.
The LCD monitor and the viewfinder 
shows an image captured with the widest 
aperture. The change in aperture affects 
the sharpness of the subject image, 
creating a discrepancy between the 
sharpness of the image before shooting 
and that of the actual image.
While you are pressing the preview 
button, you can see the image with the 
aperture used in the actual shot so that 
you can check the approximate sharpness 
of the subject before shooting.
Preview button