Using the calculator at http://www.mrpinhole.com/calcpinh.php I plugged in the numbers shown below. The numbers were very accurate for the camera that I was designing. I was using paper negatives. The most difficult task (massive quantities of time spent) was designing a "serious pinhole". Thin brass plate seems to be the best material from my own experience and from reading the earliest articles on the subject. The angle of view using those parameters appear close to a normal viewing angle in contact prints made from the 4x5 paper negatives.