Canon EOS-1D Mark IV - Manual (Page 83)

■й1Я|?ч| Lens Peripheral Illumination Correction
About the Lens Correction Data
The camera already contains lens peripheral illumination correction
data for approx. 25 lenses. In step 2, if you select [Enable], the
peripheral light correction will be applied automatically for any lens
whose correction data has been registered in the camera.
With EOS Utility (provided software), you can check which lenses have
their correction data registered in the camera. You can also register the
correction data for unregistered lenses. For details, see the PDF
Software Instruction Manual (on the CD-ROM) for EOS Utility.
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For JPEG images already captured, lens peripheral light correction
cannot be applied
Depending on shooting conditions, noise might appear on the image
periphery.
When using a third-party lens, setting the correction to [Disable] is
recommended, even if [Correction data available] is displayed.
Lens peripheral light correction is applied even when an Extender is
attached.
If the correction data for the attached lens has not been registered to the
camera, the result will be the same as when the correction is set to
[Disable].
The comection amount applied will be slightly lower than the maximum
correction amount settable with Digital Photo Professional (provided
software).
If the lens does not have distance information, the correction amount will
be lower.
The higher the ISO speed, the lower the correction amount will be.
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