Canon EOS 7D Manuel D'Instructions

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3

 Lens Peripheral Illumination Correction

The camera already contains lens peripheral illumination correction 
data for about 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 the 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 
Software Instruction Manual (CD-ROM) for EOS Utility.

 

For JPEG images already captured, lens peripheral illumination 
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 illumination 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 correction 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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