What focal length for 7km far away subject?

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FelixPoly102 New Member • Posts: 1
What focal length for 7km far away subject?

Hello, I'm in the happy situation to see mountains out of my window. I know there are some wild animals there and I want to buy a lens to shoot them out of my window which is about 7km far away. I have an aps-c camera. Is it possible to calculate this somehow? I basically want a picture that shows about 2 meters of height in 7km distance (I hope this is not silly haha). Thanks for your help!

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