Canon EOS 5D About a Auto ISO Speed, ISO Speed Guide, ISO Speed Shooting Situation Flash Range

i: Setting the ISO SpeedN

ISO Speed Guide

ISO Speed	Shooting Situation	Flash Range
	(No flash)
L, 100 - 200	Sunny outdoors	The higher the ISO speed,
400 - 800	Overcast skies, evening	the farther the flash range
		will be.
1600 - 6400, H1, H2	Dark indoors or night

If [8C.Fn II -3: Highlight tone priority] is set to [1: Enable], the settable ISO speed range will be ISO 200 - 6400 (p.177).

Using a high ISO speed or shooting in high-temperature conditions may result in more grainy images. Long exposures can also cause irregular colors in the image.

When you shoot at high ISO speeds, horizontal stripes may appear as noise.

With [8C.Fn I -3: ISO expansion] set to [1: On], “L” (equivalent to ISO 50), “H1” (equivalent to ISO 12800), and “H2” (equivalent to ISO 25600) can also be set (p.174).

About “A” (Auto) ISO Speed

If the ISO speed is set to “A”, the actual ISO speed to be set will be displayed when you press the shutter button halfway. As indicated below, the ISO speed will be set automatically to suit the shooting mode.

Shooting Mode	ISO Speed Setting
1/C/d/s/f	ISO 100 - 3200
a/ F	Fixed at ISO 400
With flash	Fixed at ISO 400*

* If fill flash results in overexposure, ISO 100 or a higher ISO will be set.

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