Having used spot metering over the years on my Nikon's today I was messing around with my Fuji XM1 and was surprised the drastic change when shooting spot vs matrix. Now this was an extreme example but it was like wow now thats isolation! I tried to find what the percentage Fuji spot metering it seems it 2% of the center of the frame and here's a laugh Fuji calls your meter Photometry yes Photometry!
Auto ISO picked 250
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Auto ISO picked 200
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Feel free guys to post your spot vs matrix in this thread if your bored