RX10IV: what causes changes in image size?

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Gav23 New Member • Posts: 7
RX10IV: what causes changes in image size?
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I'm very new to photography (and the RX10IV). I've set up my camera based on Stephen Ingraham's guide. 2 weeks ago I took some shots and when copied to from the SD card to my PC, ranged in size from 14MB to 17MB.

Last night I decided to try and take some photos of the moon. I had the mode set to P, and just played around with some of the function settings and exposure to see how they'd turn out.

However when I copied the images from the SD card to my PC the size ranges from only 1MB to 5MB. I checked my camera settings, and Quality is Extra Fine and Image Size is L: 20MB.

What would cause such dramatic differences in image size?

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Sony RX10 IV
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