Digital SLR Photography - - The Beginner's Guide -

As you’ll see later in the guide when we cover AE- Lock, you can set the cam­era to fo­cus and meter in­de­pen­dently, which is use­ful in par­tic­u­lar shoot­ing sit­u­a­tions. Some cam­eras have an AF- L ( AF- Lock) or AF- On but­ton on the rear for this pur­pose ( hence the term back- but­ton fo­cus­ing), while with oth­ers, you can set a cus­tomis­able func­tion but­ton to do this for you. You can use the AF- L/ AF- On but­ton rather than the shut­ter but­ton with both meth­ods ( A and B) de­scribed on the right. If you pre­fer, you can use the AE- Lock but­ton to lock the ex­po­sure, then use the shut­ter but­ton to lock fo­cus.

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