Archived posting to the Leica Users Group, 2001/08/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 8/4/01 12:13 AM, Erwin Puts at imxputs@ision.nl wrote: > Of course the edges of > the pinhole will generate diffraction but I wonder if it is more than that > what you would get when stopping down a lens to f/16. A pinhole is somewhere around f/200 or f/300, getting towards the size where it is possible to see the Airy disk, or diffraction interference patterns, from a point source. This is not remotely comparable to a lens stopped down to f/16 I feel that there is a fundamental misunderstanding going on here. I am not going to go into the derivation of the limit for the resolution of a pinhole optic as it is too long and boring but I posted a link to one version of it yesterday if anyone's curious. Pinhole images are indeed distortion free but to compare (on the basis of a book reproduction) to images formed by an 'older Leica lens' is really completely beyond me and, I would imagine, anyone else who has used a pinhole camera. - -- John Brownlow http://www.pinkheadedbug.com ICQ: 109343205