Math: Focal length vs cropping

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Lichtspiel
Lichtspiel Veteran Member • Posts: 3,494
Math: Focal length vs cropping

Can someone enlighten me... I get easily lost when it comes to math, squares and angles.

If you take an image with a 60MP camera and a 200mm lens, and then crop that resulting image to 24MP, what would the equivalent focal length be? About 300?

Is there an equation for this?

 Lichtspiel's gear list:Lichtspiel's gear list
Sony a7C Voigtlander 15mm F4.5 Super Wide Heliar Sony FE 20mm F1.8G Tamron 70-300 F4.5-6.3 Di RXD III Samyang Reflex 300mm F6.3 +5 more
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