Sony A390 ユーザーズマニュアル

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• The shutter speed may become slower depending on the aperture value. 
When the shutter speed is slower, use a tripod.
• To blur the background more, use a telephoto lens or a lens that is 
equipped with a smaller apperture value (bright lens).
• Set the flash mode to   (Fill-flash) when you shoot with the flash 
(page 82). However, the flash range differs according to the aperture 
value. When you shoot with the flash, check the flash range (page 84).
2
Select the aperture value (F-
number) with the control dial.
• Smaller F-number: The foreground and 
background of the subject are blurred.
Larger F-number: The subject and its 
foreground and background are all in 
focus.
• You cannot check the blurring of an 
image on the LCD monitor or in the 
viewfinder. Check the recorded image 
and adjust the aperture.
Aperture (F-number)
3
Adjust the focus and shoot the 
subject.
The shutter speed is automatically 
adjusted to obtain correct exposure.
• When the camera judges that the proper 
exposure is not obtained with the 
selected aperture value, the shutter 
speed flashes. In such cases, adjust the 
aperture again.
Shutter speed
Shooting techniques