Canon Macro Ring Lite MR-14EX II - Manual (Page 23)

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Simply set the camera’s shooting mode to (aperture-priority AE)
or (manual exposure) and you can perform advanced macro flash
shooting using E-TTL II/E-TTL autoflash.
When the shutter speed is manually set with the shooting mode set to
(Shutter-priority AE), the aperture will be set automatically. However, this is not
recommended because the aperture cannot be set manually.
If you use the < Z> or shooting mode, the result will be the same as
using the (Program AE) mode.
1/X sec. is the camera’s maximum flash sync speed.
Using E-TTL II and E-TTL Autoflash by Shooting Mode
f
You can perform flash shooting while obtaining a standard exposure of
both the main subject and background while considering the depth of
field.
Select this mode when you want to set the aperture manually. The
camera will then automatically set the shutter speed, matching the
aperture to obtain a standard exposure. If the scene is dark, a slow
sync speed will be used to obtain a standard exposure for both the
main subject and background. Standard exposure of the main subject
is obtained with the flash, while a standard exposure of the background
is obtained with a long exposure using a slow shutter speed.
Since a slow shutter speed will be used for low-light scenes, using a
tripod is recommended.
If the shutter speed display blinks, it means that the background
exposure will be underexposed or overexposed. Adjust the aperture
until the shutter speed display stops blinking.
a
Select this mode if you want to set both the shutter speed and aperture
manually.
Standard exposure of the main subject is obtained with the flash. The
exposure of the background is obtained with the shutter speed and
aperture combination you set.
Flash Sync Speeds and Apertures Used
Shutter Speed Aperture
d Automatically set (1/X sec. to 1/60 sec.) Automatically set
f Automatically set (1/X sec. to 30 sec.) Manually set
a Manually set (1/X sec. to 30 sec., Bulb) Manually set
COP
Y