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Modern Classic SLRs Series : 

Canon F1

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Helper Page 1 (Front)

This section covers:

Power Source for Light Metering
Battery Check
Film Advance Lever
Viewfinder info
Focusing

Power Source for Light Metering

Into the bottom part of the camera body, insert one 1.3 V H-D type mercury 
battery, equivalent to the US Mallory PX 625 or the Eveready EPX 625. 

Do not use

 higher voltage (over 1.4 V) mercury batteries, such as Mallory RM 

625 or Eveready E 625 E, since they will cause the meter to read too high causing 
under-exposure reading.

This is the camera's power source for exposure metering. The battery chamber can 
be opened by unscrewing it with a coin. Be sure to place the battery with the (+) 
and the (-) poles in the correct position. A new battery will work for about a year.

Battery Check

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