Exposure Lock - What is it and why would you use it on a DSLR?
What is AE-Lock on a Camera? - Improve Photography
Exploring The Auto Exposure Lock. This function locks the camera exposure for as long as the AE-L button… | Aperture and shutter speed, Photography tips, Photo tips
AE Lock Button: a Quick and Easy Way to Adjust Exposure - Better Travel Photos
How to use exposure lock on GoPro Hero 10.9,8,7 - YouTube
Control Focus & Exposure Separately in Your iPhone's Camera for Pro-Level Photos « iOS & iPhone :: Gadget Hacks