ISO: Press and hold the Fn button (page 19) while turning the rear dial, slowly. You'll cycle through all the ISO Settings. (page 25) . An added nicety lacking on more expensive Nikons is that you have full ability to go to and from ISO 3,200 (HI 1) without needing to turn off Auto ISO (page 30).
WB: I use this option, since I change my WB more often than any of the other options.
Press and hold the Fn button (page 19) turning the rear dial, slowly. You'll cycle through all the WB Settings (page 24). An added nicety is that you can set a manual preset (white or gray card) white balance by holding down the Fn button again after selecting PRE. More at my D40 WB section (page 24).
12 AE-L/AF-L
This selects what
AE/AF lock (default) locks both for as long as you hold the button. You'll see "EL" in the bottom left of the finder when it's locked. There is no
AE Lock only holds the measured exposure for as long as I hold the button. I use this setting. You'll see "EL" in the bottom left of the finder when it's locked. I usually shoot in Single or Auto AF mode
AF Lock only locks the autofocus. This is handy if you want the lens to stop focusing, for instance, if reframing a portrait or if you're panning while a target goes behind a tree. There is no
AE Lock Hold requires just a tap, after which the D40 holds the exposure until you tap it again. You'll see "EL" in the bottom left of the finder when it's locked. This eliminates the need to hold the button, but also requires you to remember to press the button again to unlock, and press a third time to lock again.
AF ON focuses the D40 when the
13 AE Lock
This lets you lock the exposure when the shutter is pressed.
The default is off, which I use. The shutter button doesn't lock exposure.
I prefer to use the
14 Built In Flash
This lets you set the function of the excellent
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