You may have noticed markings on your mode dial such as C-1,
or U-1. These are used to create customized camera menu settings that you can automatically
recall and use for specific lighting or scene conditions. These can be as
simple or as complex as you might want, and can combine a number of different
setting combinations. The dials are best used for scenes and lighting
conditions that you often shoot, but they are so easily set up that you can
change them from day to day.
For example, you can program a set that would include a
specific white balance, metering pattern, exposure compensation and exposure
priority. That set might be Cloudy white balance, spot metering, minus 2/3 EV
compensation and aperture-priority exposure mode: this might be apt for fall
foliage shots.
Or, you could make a set of commands that include
autoexposure bracketing with a plus/minus 1 EV spread; this could be used for
making exposures for HDR shooting. And you might want to create a set
for sports photography in an arena lit by tungsten light, which would include a
specific white balance, continuous advance mode and shutter-priority exposure
mode.
Each camera has a slightly different route to make these
sets. Generally you create the set and then simply turn the dial to, for
example, C1. You then confirm this group of settings as a user group on your camera menu using the OK button or similar. This stays in the camera memory and whenever you turn the mode dial to C1 those settings are
automatically applied. Some advanced cameras allow you to "name" the group as well.
By programming a combination of settings and assigning them
to a Custom User dial you can quickly get all the options you might ordinarily have
to set individually for a specific subject or scene. For example, you might
want to create a “landscape” User Custom setting that might include
aperture-priority exposure mode, Daylight white balance, Center-weighted
Averaging metering pattern and Adobe RGB color space.
Settings: With a 28mm lens, at ISO 100, CWA metering pattern.
Daylight white balance, aperture-priority mode at f/11 at 1/125 second.