From: Ken Hart <>
Subject: Re: "Pinhole S" on Kickstarter!
Full headers:
From: Ken Hart <>
Subject: Re: "Pinhole S" on Kickstarter!
Date: Sat, 18 Nov 2017 14:11:02 -0500
Organization: NNTP Server
Lines: 23
Message-ID: <ouq0k4$17kg$>
References: <>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101
X-Notice: Filtered by postfilter v. 0.8.2
Content-Language: en-US
Print Article
Forward Article
On 11/18/2017 12:42 PM, PeterN wrote:
> On 11/17/2017 7:58 PM, RichA wrote:
>> f/128 is the right diameter for a given sensor size, as I recall, but 
>> that's a guess.  Precision pinholes cost money (consult a professional 
>> optics house) and if they aren't precision, various unwanted 
>> aberrations can creep in, notably, irregular diffraction.
> The right diameter will vary with sensor size and the distance from the 
> hole to the sensor. Irregular diffraction will occur if the hole is not 
> round. Besides, some diffraction is part of the beauty of a soft focus 
> pinhole.

"the beauty of a soft focus pinhole."
Isn't that why they make the Holga?

Ken Hart