PringCam 1.0
This is a pinhole camera I've been working on, what I've dubbed "PringCam 1.0." My main objective with this one is to try and achieve an image resembling one taken with a telephoto lens. With the specifications I've ended up with for it, looks like I have indeed recreated a telephoto camera. I tried a test shot with it (about a year and a half ago), using Tri-X and an exposure which lasted approximately 10-15 seconds. After I measured everything and crunched the numbers, I can see why my scanner couldn't register any image on the negative. My exposure was about an hour too short!
Specs:
Pinhole size: Approx. .15mm
Focal length: 10 5/16 inches (261.937 mm)
Aperture: F/1747