Spot exposure lock

[Sillygoose]

Hi. Please can someone help a newcomer to the world of custom buttons on the A7ii? I wanted to use back button focus and so disabled the shutter  focus button and have set the AEL button to Focus On. That works fine  - just what I wanted. However, when using Spot metering how do I lock that spot meter reading and then recompose my photo? Holding the customised AEL button doesn't do it and nor does the shutter button? I know I am missing something obvious but would appreciate some help. Thanks 

[Heyrudeboy]

I'm sure you can couple AE lock to the shutter button in the custom keys menu.

[addicted2light]

The AEL button on the back has a switch (the ring around it). So you can assign to the AEL button 2 different custom functions: 1 with the switch up on the "AF/MF" position (for example "focus on"), 1 with the switch down on the "AEL" position (for example "meter reading lock"). 

 

At this point you would normally keep the switch up to "AF/MF" to use it as "Focus on", and move the switch down to the "AEL" position before pressing the button when you need to lock the spot meter reading.