Exposure Lock (AE-L Button) is the abbreviation stands for Automatic Exposure Lock. It is useful using automatic and semi-automatic shooting modes. Where has this information been all my photographing life? So freaking helpful it's not even funny.
10 camera settings you need to learn to master your Nikon (and 10 you can manage without) Digital Camera World. Photography tips. Tap the link for an awesome selection cat and kitten products for your feline companion!
To be comfortable shooting manual, you will need to know what your necessary adjustments are. Though these settings are all numeric, there isnt some insane math equation that you need to do to find out what to dial.