How Well Do Mobile Telephoto Lenses Work

I found that binoculars are better, especially because I usually already have them. Detailed comments here:
https://forum.inaturalist.org/t/macro-and-telephoto-lenses-for-smartphone-cameras/9112
https://forum.inaturalist.org/t/macro-and-telephoto-lenses-for-smartphone-cameras/9112

And I’m sure other people have suggestions on that thread.

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