this post was submitted on 22 Nov 2023
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Photography

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How to calculate how to crop an image to reflect a longer focal length specifically please ? (alien.top)
submitted 1 year ago by Smirkisher@alien.top to c/photography@viewfinder.pro
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Hi,

I've got my hands on a 400mm telephoto lens to try, as i don't own any telephoto lens, to see which focal length would suit my needs.

I took all the shots i wanted to take, but for most i was too far away.

I would like the be able to deduce from the shots i've made which focal length would have been appropried for the results i wanted to do, that is, by cropping the images i've got.

Do you know any calculations that would allow me to translate the crop i will do to relate which focal length would have matched the same field of view ?

Thanks !

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[–] Smirkisher@alien.top 1 points 1 year ago

Thanks for the detail, perfect. I'll crop as I wish and see what focal length would have been ideal.