LOL! This very much reminds me of days gone by when my brother, one of those who got me interested in photography, had a Pentax HV (a pre-Spotmatic one with a non-TTL meter mounted above the prism) and this huge honking cheap 300 or 400mm lens from the Spiratone shop on 31st in the city. He called this his "beach lens" and he and a couple of his buds would go to the beach, set up a "blind" behind a huge beach umbrella, take along a thermos jug of "kool-aid" (yeah, right, lol) and they would enjoy the scenery and the refreshments.
This was back in the late 1960s, a more innocent time, and swimwear of those days was not nearly as revealing as it is now. We just kinda laughed this off as a "boys will be boys" thing.

They were, of course, too shy to actually approach and get to know any of the girls they were admiring.
Anyway, this lens was the most clumsy thing I've ever seen. To set the exposure you had to take a more or less manual meter reading, set a ring on the lens to your desired F-stop, focus on your subject, then turn a second ring to set the real f-stop, then shoot.
The funny thing is, sad thing, actually, if somebody would do this today, they would probably be arrested or at least confronted.