Focal length maths

Started 1 month ago | Questions thread
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Edw987 New Member • Posts: 5
Focal length maths

Hi does anyone know how to help me understand how to work this out, if I Have the Sony 24-105mm lens on my a7riv in crop mode it’s field of view is 157mm I believe but what would be effective field of view be if I cropped down to 20mp from 26mp? Just trying to find out so u can compare it with the Sony RX10 iv focal length that I’m considering purchasing thx

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Sony a7 Sony a7R Sony Cyber-shot DSC-RX10 Sony RX1 Sony RX10 IV
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