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submitted 2 weeks ago by xkcdbot@lemmy.world to c/xkcd@lemmy.world

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Title text:

I'm trying to buy a gravitational lens for my camera, but I can't tell if the manufacturers are listing comoving focal length or proper focal length.

Transcript:

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[-] Zacryon@feddit.org 1 points 2 weeks ago* (last edited 2 weeks ago)

I missed some puns as it seems. E.g. the comoving or proper distances in gravitational lenses. Or the spicy liquid mirrors.

this post was submitted on 17 Dec 2025

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