Without Lenses: Comments on stories by Earl Johnson

Earl Johnson — Mon, 28 Jan 2008 16:22:38 GMT

Andy – I don’t have a Polaroid back, but if I ever get one, I will make it work on my 4×5 cameras.

Kathia – f stop is the distance from pinhole to film divided by the aperture diameter – thus my 120 mm 4×5 camera with a .4 mm pinhole is 120/.4 or f300. You can use a scanner to measure the diameter of your pinhole. There are also relatively inexpensive magnifiers with measuring reticles available – check out the Peak Optics website.

kathia Alsina — Thu, 13 Dec 2007 23:47:49 GMT

Good article Earl; I build my own 4×5 few months ago, and I have problems measuring the pinholes. In fact when I try to convert from the pinhole size to F/stop. Can you give a hand on this?

thanks , kathia

Andy Schmitt — Mon, 10 Dec 2007 19:32:27 GMT

Really well done Earl. Good organization, detailed, good illustrations. I’ve been thinking about writing an article on a different kind of Pinhole camera. You’re a good inspiration… thanks
btw… have you thought of a back modification to allow Polaroid film holders?

Earl Johnson — Tue, 04 Sep 2007 11:52:19 GMT

Olympus digital camera.