Focus/Metering Icon on the app - need explanation/tutorial

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Can someone explain or point me to an article that explains this option below please? How and when would you use it and does it interact with the AE LOCK icon right next to it?

Focus/Metering Button / : Tap to switch between focus and metering mode. Tap to select object for focusing or metering.

Thanks for the help!
 
I will like to ask what is the difference between Focus and Metering modes? I do photos for land survey and topography, which is best?
 
Focus makes the picture clear, metering (exposure) makes the photo light or dark (plus contrast etc). A perfectly metered photo can be out of focus and/or a perfectly focused photo can be under or over exposed. We will leave aperture adjustment for depth of field to another time.
 
Focus makes the picture clear, metering (exposure) makes the photo light or dark (plus contrast etc). A perfectly metered photo can be out of focus and/or a perfectly focused photo can be under or over exposed. We will leave aperture adjustment for depth of field to another time.

Thank you very much.
 

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