Just to be clear, you don't have to hold the AE lock button whilst you take a shot. You just point the camera at what you want to meter off and press the AE lock button (press and let go). This sets AE lock to on (you will see "EL" appear in on the bottom left hand side of the viewfinder display). The AE Lock will remain active for all subsequent shots until you switch AE lock off.
My D70 menu settings if you are interested are as follows:
menu item 15 "AE-L/AF-L" set to AE Lock hold
menu item 16 "AE-L button" set to OK (this means a half press of the sutter will NOT activate AE lock.
Then i think I'm right in saying that you can adjust the length of time the AE-Lock remains on by setting menu item 23 "Meter-off" to something like 16s or 30min. If you do set this to a long time period though don;t forget to manually turn AE lock off when you have finished shooting your subject by pressing the AE Lock button again.
Hope this helps.
Glenn
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