I have a Zenza Bronica EC, which is a medium format 6x6cm (2-1/4 x 2-1/4″) camera. One of the nice things about it is that it has two ways to mount a lens: it will accept a Bronica S/S2 type lens, or it will accept a simple screw-mount lens as well (57mm diameter I believe). This happens to work well with a very common Minolta extension tube set found on ebay. I turned the cap and one of the rings into a pinhole “lens”, by drilling a hole in the cap. I placed over it a pinhole I’d made a couple of years ago from tin, measured somewhat precisely using my scanner. It had an aperture of f/369 (no that’s not a typo!). So using Fuji HGII ISO 800 film, my exposure was 1/2 s to 1 s in full sunlight. The “lens” focal length was about 110mm, so slightly telephoto for the angle of view.
I like the blurry people, but I’m not very fond of the overall unsharpness. I did intentionally build sand castles and rock towers and placed the camera near them, so that the sense of scale would be distorted. But ultimately I don’t know if this is the best subject matter for pinhole (in my opinion, anyway).
The very last shot is one I took with a regular 75mm lens. F/16 at 1/1000 sec. I used that lens to help line up the shot before switching over to the pinhole.