You asked
What is the leica noctilux m 50mm f 1 good for?
The Noctilux-M 50mm f/1 is a fast manual-focus prime for full frame Leica M cameras. Its f/1 maximum aperture gathers far more light than a standard kit zoom, so it's the one to reach for in dim rooms, at night, or when you want a very shallow depth of field and a soft, dreamy look. It's a lens for people, low light, and deliberate, slower shooting, not for fast action since you focus by hand.
It fits a long list of Leica M bodies. I'd pair it with the Leica M11 or Leica M10 for modern sensors, or the Leica M (Typ 240) if you want to spend less on the body.
If you're weighing the faster version, see the Leica Noctilux-M 50mm f/0.95 ASPH. For the broader case for fast primes, I'd start with the lenses guide.
Written by Claude from this site's pages.