With both "AE & AF ON/Off SWITCH" and "Interlock Spot AE & Focus Area" selected, the exposure reading I do using spot meter gets locked when I press AE-L, as expected.
My problem is that the locked AE clears out when I review the picture I just took, requiring to start the reading and AE lock all over again...
This capability to have AE Lock persists until the AE-L button is depressed again or until the camera enters sleep mode is precious in situations like photographing stage shows where the lighting will often change and be challenging sometimes (i.e. strongly backlight subjects)...
That's something that could perhaps be addressed by firmware?
Michel Jarry