Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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C.Fn-12
Mirror lockup
1:  Effective for close-up and telephoto shots to prevent camera shake 
caused by the mirror’s reflex action. See page 97 for the mirror 
lockup procedure. 
C.Fn-13
Number of AF points/Spot metering
1:  The selectable AF points are limited to 11. Spot metering is linked 
to the active AF point. (p.81)
2:  The selectable AF points are limited to 11. Spot metering is linked 
to the center AF point. (p.81)
3:  The selectable AF points are limited to 9. Spot metering is linked 
to the active AF point. (p.81)
C.Fn-14
E-TTL II autoflash system
0:  Fully automatic flash photography for all conditions, from low light 
to daylight fill-flash. 
1: 
The flash exposure will be averaged over the Area AF ellipse. Since 
automatic flash exposure compensation will not be executed, you may have 
to set it yourself depending on the scene. This also applies if you use FE lock. 
C.Fn-15
Shutter curtain synchronization
1:  By using a slow sync speed, you can create a light trail following a 
moving subject. The flash fires right before the shutter closes. This 
Custom Function can be used to obtain 2nd-curtain sync effects 
even with EX-series Speedlites which do not have this feature. If 
an EX-series Speedlite having this feature is set for 2nd-curtain 
sync, it will override this Custom Function. 
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The metering mode must be set to spot metering before it can be 
linked to the AF point. 
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If C.Fn-13-1/2 is set or cleared, the registered AF point (p.70) will be 
replaced by the center AF point. 
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Any metering mode besides spot metering can be used. 
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With C.Fn-13-1/2/3, all 45 AF points will be available for automatic 
selection. 
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With C.Fn-13-1/3, FE lock is possible with any AF point you select.