Sunday April 24 was Worldwide Pinhole Photography Day.
Photographers throughout the world are encouraged to participate.
Pinhole photography involves using any device, along with a small pinhole, to capture images projected onto a plane through the hole, with no lens optics used.
This time I used a Pentax body cap, into which I had mounted a small piece of aluminum with a tiny hole pricked into the center.
Under a microscope, I estimated the hole to be about 0.3 mm in diameter, and on the Pentax body it yielded an aperture of about f:160.
With so little light coming through the hole into the camera's normal viewfinder system, it helped to mount an auxiliary finder onto the top shoe. One of my favorite auxiliary finders is the square type variable finder that was offered by Argus in the 1950's.
The Pentax *ist D body has a digital sensor, and I cranked up the ASA to 3200. With camera set to Manual, and doing a few calculations, I was able to shoot with exposure times of as little as 1/30 second when out in the daylight. Interior images took a second or two. Grain was not all that bad at that ASA with this camera.
I started my set here in the studio with a few setups, then later in the day I went down to the riverfront area on the Meramec in Old Town Fenton.

Tripod and remote shutter release kept it steady.

Please click on thumbnails to see enlarged.
All images are Copyright 2016 E.J.Kowalski.
Thanks! Ed