#3182 Telescope Types
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.
https://xkcd.com/3182/
@xkcd I'm still dreaming about having a decent monolithic Schmidt-Cassegrain in my smartphone
https://www.youtube.com/watch?v=2lf6uuU51Z8
That'd be fun!
https://www.youtube.com/watch?v=2lf6uuU51Z8
That'd be fun!
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