xkcd

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submitted 1 week 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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[–] MadMadBunny@lemmy.ca 2 points 1 week ago* (last edited 1 week ago)

Narcissian LOL