Canon 512XL - Manual (Page 16)

3 Battery Check
Press battery check button to check battery
capacity.
Blue; Shooting at all frame speeds possible.
White; Shooting at 18 and 9 frames per second possible.
Red; Change to a complete set of new batteries. All
four batteries at a time.
•Remove the battery from the camera and keep it
separate when not using the camera for a length of time.
A
Dioptric Adjustment
' First, turn the focusing distance ring to infinity.
Then turn the dioptric adjustment (viewfinder focus)
ring while viewing the sky until the fine lines in the
center circle appear clear and sharp.