C.fn-5 Highlight Tone Priority; C.fn-6 Auto Lighting Optimizer - Canon EOS 450D Instruction Manual

Custom Function Settings*
0: Disable
1: Enable
improves the highlight detai!. The dynamic range is expanded from the
standard 18% gray to bright highlights. The gradation between the grays
and highlights becomes smoother.
With Setting i ithe Settable [SO speed [ange wil! be 200 _ i600.
Also, the ISQ speed displayed in the viewfinder, will have the '!0'_displayed
as a smaller character such as 120o1[:when the imagels shooting
info[mation (p.13!) is displayed, the {SO speed's !!0'!will also be displayed
as a smaller character.
0: Enable
if the image comes out too dark or the contrast is too low, the image
brightness and contrast are corrected automatically. (Depending on the
shooting conditions, image noise may increase.) This function will not
work with manual exposures nor _ and _+A k images.
in the Basic Zone modes, the Auto Lighting Optimizer w[[[ operate
automatieally.
IIIIIIIIIl_ll,,
1: Disable
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