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I loved this[1] recent video by DIY Perks and think you would enjoy it too. He essentially builds a housing for a lens with a massive aperture.

[1] https://www.youtube.com/watch?v=9cT0jXI7l4E

The Nikon COOLPIX P1000 has a very silly 3000mm equivalent superzoom.

https://www.dpreview.com/reviews/nikon-coolpix-p1000

For silly apertures, you want the Pinhole Pro Max.

https://www.pcmag.com/news/hands-on-thingyfys-pinhole-pro-ma...

Would you be interested in a true 3248 mm f/8?

https://www.telescope.com/Astrophotography/Astrophotography-...

Telescopes do tend to prefer specifying girth rather than length, though.

I've used a refractor (4" lens, f7, 714mm focal length) as a telephoto. It's great. I ended up buying a crazy-ass lens and building a solar telescope (look at the sun) which was fun until the focal point melted the enclosure.

> f/9001

I see what you did here.