Thanks. I think I scanned it at high res and did some mesaurements and calculations. ~f/226 is what I came up with.
Originally Posted by Mainecoonmaniac
I've got to go back to a point Ralph just made. Maybe I got lucky crafting such a sharp pinhole -- I did a lot of research at the time and was pretty meticulous. But I remember being initially disappointed with the super sharp images I was getting. In some cases (like what I posted) it worked well, but I was after something softer and not so perfect, like many of the great pinhole images I had seen in books and online.