Sony DCR-TRV940 Operating Instructions Manual page 30

Recording a picture
Adjusting the viewfinder
If you record pictures with the LCD panel closed, check the picture with the viewfinder.
Adjust the viewfinder lens to your eyesight so that the images in the viewfinder come
into sharp focus.
Lift up the viewfinder and move the viewfinder lens adjustment lever.
Viewfinder backlight
You can change the brightness of the backlight. Select VF B.L. in the menu settings
when using the battery pack (p. 210).
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The viewfinder lens
adjustment lever