From: Ken Hart <kwhart1@frontier.com>
Subject: Re: "Pinhole S" on Kickstarter!
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From: Ken Hart <kwhart1@frontier.com>
Newsgroups: rec.photo.digital
Subject: Re: "Pinhole S" on Kickstarter!
Date: Sat, 18 Nov 2017 14:11:02 -0500
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On 11/18/2017 12:42 PM, PeterN wrote:
> On 11/17/2017 7:58 PM, RichA wrote:
snip
>>
>> 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
kwhart1@frontier.com