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Re: [OM] Totally off topic, Worldwide Pinhole Photograpgy Day image

Subject: Re: [OM] Totally off topic, Worldwide Pinhole Photograpgy Day image
From: NSURIT@xxxxxxx
Date: Mon, 18 May 2009 18:40:44 EDT
Moose, I suspect it is the precision laser cut hole that gives the sharp  
image as opposed to a less precise needle through the material and sanded  
hole.  The circles of confusion would be more scatter perhaps.  a  couple of 
place to start might be : _http://www.pinholeresource.com/shop/home_ 
(http://www.pinholeresource.com/shop/home)    and f295.com.  I actually can 
forward 
some others however my mens prayer  meeting is starting soon.  You may read 
that as my infrequent poker game  with the guys.  Bill Barber
 
 
In a message dated 5/18/2009 4:06:20 P.M. Central Daylight Time,  
olymoose@xxxxxxxxx writes:

NSURIT@xxxxxxx wrote:
> The Zero Image pinhole cameras give  really sharp images. 

Without taking a position on whether sharp is  good or not in a pinhole 
image, I'm curious. You are both more experienced  and better read than I 
am on pinhole technology. Do you have an idea why  they may be sharper 
than other pinholes?

Assuming a modestly  competent method of holding the film, it seems to me 
that the only  variables are pinhole to film distance, pinhole diameter 
and pinhole  configuration.

A laser punched hole will look sorta like this ] [ ,  while one created 
by abrasion will look sorta like this > <. The two  types will obviously 
have different diffraction characteristics and the  thickness of the 
medium in the first will affect interaction of the  refractions at the 
two edges as well as reflections in the  "tube".

Any ideas or resources to point me to?

Moose
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