
That's not how I use it, I tend to press AF-ON to lock focus, then recompose, half press shutter button to lock exposure and shoot.
I can use the AE button if required to lock exposure at anytime, but find more often than not I take the metering from the recompose rather then the initial focus point.
Not sure why you are using the BB to recompose, seems to take away the point of using this method or maybe I have it all wrong
Afraid I don't know for Nikon, but from a quick google this is how you set the AE button for one press exposure lock without keeping it pressed
In Custom Setting Menu,
- c1 -> "OFF"
- f7 -> "Assign AE-L/AF-L button" -> "AE/AFL button press" -> "AE lock (Reset on release)"->"OK"
Will leave you to sort out the AF-ON button, reckon its get the manual out time
No problem Ben, wasn't being sarky, not too well up on the smiley placement
Its a good method especially in my case for landscapes, can focus on the hyperfocal distance knowing that focus point is locked in without fiddling aboout changing the lens to manual.