I have a Canon Rebel T3 DSLR. Under the menu options, there is a metering option that I don't quite understand its purpose. This option is called "Metering Timer." When selected it gives the choice of various time increments, such as 4 sec., 16 sec., 30 sec., 1 min., 10 min., and 30 min., maximum.
Could someone familiar with Canon cameras explain this option and what it does? I've consulted the manual about it, but I still don't quite understand how it actually works. Thanks!