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submitted 1 month 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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[–] hemko@lemmy.dbzer0.com 1 points 3 days ago

Same, but I don't think I've seen 10 movies in that genre

All I can think are