Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

3

 Custom Function SettingsN

486

If the <a> mode (manual exposure shooting) is set and the ISO 
speed is set manually (except when set to ISO Auto), the open 
aperture value may change to a higher number (a smaller aperture) if 
you perform any of the following: 1. Change the lens, 2. Attach an 
extender, or 3. Use a zoom lens whose open aperture value (f/number) 
changes. If you then shoot while the maximum aperture is set, the 
image will be underexposed by the amount the maximum aperture f/
number changes to a higher number. However, by changing the ISO 
speed or shutter speed (Tv) automatically, you can obtain the same 
exposure that would be obtained without performing 1, 2, or 3.
OFF: Disable

Automatic changes in settings to maintain the specified exposure 
will not be applied. The ISO speed, shutter speed, and aperture 
already set will be used for shooting. If you perform 1, 2, or 3 and 
the maximum aperture becomes slower, adjust the ISO speed and 
shutter speed before you shoot.

If you perform 1, 2, or 3, a higher ISO speed will be set 
automatically to compensate for the number of stops the maximum 
aperture has become slower. The same exposure that would be 
obtained without performing 1, 2, or 3 is thereby obtained. The ISO 
speed will change automatically within the range set with [Range 
for stills].

If you perform 1, 2, or 3, a higher ISO speed will be set 
automatically to compensate for the number of stops the maximum 
aperture has become slower. If the ISO speed reaches the upper 
limit of the range set with [Range for stills], a slower shutter 
speed will be set automatically. The same exposure that would be 
obtained without performing 1, 2, or 3 is thereby obtained. The 
shutter speed will change automatically within the range set with 
[82: Set shutter speed range].