This year for Worldwide Pinhole Photography Day I used two cameras.
The first was a digital Pentax body with pinhole in a body cap. I have already posted a gallery with those results.

My second camera used is a rather old Kowa SET slr body. The body's shutter mechanism was deactivated, and I mounted a pinhole plate into a "vintage" Alphax leaf shutter, replacing the camera's original lens body. Distance from hole to film plane is 65mm, and with a hole estimated to be 0.14mm in diameter, it yields an f/stop of 464. The auxilary finder on the accessory shoe is needed for aiming.

I loaded this camera with an old freezer stock roll of asa 800 Fuji, 36 exposure.
Camera worked.
That 800 Fuji did show its grain, particularly in low light.

Please click on thumbnails to see enlarged.
All images are Copyright 2015 E.J.Kowalski.
Thanks! Ed