Canon EOS 50D - Manual (Page 180)

180
3 Custom Function SettingsN
C.Fn III -6 Mirror lockup
0: Disable
1: Enable
Prevents camera vibrations caused by the reflex mirror action which can
disturb shooting with super telephoto lenses or close-up (macro)
shooting. See page 106 for the mirror lockup procedure.
C.Fn III -7 AF Microadjustment
Normally, this adjustment is not required. Do this adjustment
only if necessary. Note that doing this adjustment may prevent
correct focusing from being achieved. AF adjustment cannot be
done during Live View shooting in Live and Liveu modes.
You can make fine adjustments for the AF’s
point of focus. It can be adjusted in ±20 steps
(-: Forward / +: Backward). The adjustment
amount of one step varies depending on the
maximum aperture of the lens. Adjust, shoot
(73), and check the focus. Repeat to
adjust the AF’s point of focus.
With setting 1 or 2 selected, press the button to view the register
screen.
To cancel all the registered adjustments, press the button.
0: Disable
1: Adjust all by same amount
The same adjustment amount is applied to
all lenses.
2: Adjust by lens
An adjustment can be set individually for
any particular lens. Adjustments for up to 20
lenses can be registered in the camera.
When a lens whose focus adjustment has
been registered is attached to the camera,
its point of focus will be shifted accordingly.
If adjustments for 20 lenses have already
been registered and you want to register an adjustment for another lens,
select a lens whose adjustment can be overwritten or deleted.
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