after a lot of experimentation with various zone sieve designs for Leica rangefinder cameras, I found that this one works best:

Skink Pinhole Pancake
Focal length/ zone sieve distance to film: 24mm f/72

Angle of View: 84° just as wide as an Elmar or Summilux 😉
Film: Fuji Superia 200

overcast afternoon sky

the zone sieve used here has only two clear concentric rings with small circles. Some highlights are visible, while image sharpness is just fine. The painterly effect reminds me a little of Monet’s paintings.