Canon eos5d manual Peripheral Illumination Correction

IV. PERFORMANCE AND RELIABILITY 27

On both the EOS 50D and the EOS 5D Mark II, you access High ISO noise controls via (C.Fn II-2). There are four settings: Standard, Low, Strong and Off (the default is Standard).

On either camera, the maximum burst rate should remain the same (3.9 fps on the EOS 5D Mark II and 6.3 fps on the EOS 50D) when the High ISO setting is set to either Standard or Low. However, burst speed will slow down slightly when the Strong setting is used, due to the extensive level of in-camera processing required.

Peripheral Illumination Correction

The DIGIC 4 Image Processor found in both cameras powers an image processing tool formerly found only in Canon’s Digital Photo Professional (DPP) software: Peripheral Illumination Correction (PIC). When it is activated via the menu, JPEG images are automatically corrected for light falloff towards the edge of the image. This problem isn’t always noticeable prior to correction, and varies by type of lens and aperture used, as well as the distance a lens’ focus is set to. Both cameras are capable of storing the required lens correction data for up to 40 Canon lenses. When shipped, the data for 26 lenses (including the kit lens) is loaded into the camera. Up to 14 additional lenses can be registered in the camera, and if more are needed, you can delete unused lens data via the EOS Utility software included with the camera. If a lens is supported, a notice “Correction Data Available” will appear in the menu control.

Lens Peripheral Illumination Correction (EF 16-35mm f/2.8L USM at wide end)

CorrectedNot Corrected

EF16-35mm f/2.8L II USM	EF28-105mm f/3.5-4.5 II USM	EF28mm f/2.8
EF17-40mm f/4L USM	EF28-105mm f/4-5.6 USM	EF35mm f/1.4L USM
EF20-35mm f/3.5-4.5 USM	EF28-135mm f/3.5-5.6 IS USM	EF35mm f/2
EF24-70mm f/2.8L USM	EF28-200mm f/3.5-5.6 USM	EF50mm f/1.2L USM
EF24-85mm f/3.5-4.5 USM	EF28-300mm f/3.5-5.6L IS USM	EF50mm f/1.4 USM
EF24-105mm f/4L IS USM	EF14mm f/2.8L II USM	EF50mm f/1.8 II
EF28-90mm f/4-5.6	EF20mm f/2.8 USM	EF85mm f/1.2L II USM
EF28-90mm f/4-5.6 II	EF24mm f/1.4L USM	EF85mm f/1.8 USM
EF28-90mm f/4-5.6 II	EF24mm f/2.8
EF28-105mm f/3.5-4.5 USM	EF28mm f/1.8 USM

The EF28-90mm f/4-5.6/II/III and EF28-105mm f/3.5-4.5/II have the same optics so they are all represented (displayed) as "EF28-90mm f/4-5.6" and "EF28-105mm f/3.5-4.5" respectively.