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xkcd #3182: Telescope Types
(imgs.xkcd.com)
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:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3182/
The wires also bend the light which makes the stars not look like points but gives them prongs.