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Subject: Re: "Pinhole S" on Kickstarter!
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From: PeterN <"peter,newdelete"@deleteverizon.net>
Newsgroups: rec.photo.digital
Subject: Re: "Pinhole S" on Kickstarter!
Date: Sat, 18 Nov 2017 20:39:43 -0500
Organization: NewsGuy - Unlimited Usenet $23.95
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On 11/18/2017 7:21 PM, RichA wrote:
> On Saturday, 18 November 2017 09:43:02 UTC-8, PeterN  wrote:
>> On 11/17/2017 7:58 PM, RichA wrote:
>>> On Friday, 17 November 2017 08:02:52 UTC-8, Ken Hart  wrote:
>>>> On 11/17/2017 09:22 AM, Whisky-dave wrote:
>>>>> On Friday, 17 November 2017 13:25:35 UTC, android  wrote:
>>>>>> Bound to happen...
>>>>>>
>>>>>> <https://www.fujirumors.com/new-pinhole-pro-s-wide-angle-now-kickstar...
>>>>>> also-fujifilm-x-mount/>
>>>>>>
>>>>>> Make one for less than $2 with the easy to follow instructions on my
>>>>>> site:
>>>>>>
>>>>>> <https://wp.me/P3strj-7f>
>>>>>
>>>>> Strange term pinhole for a 5mm or so hole ;-)
>>>>>
>>>>> I remmeber the days when a pinhole was made with a pin.
>>>>>
>>>>
>>>> Just my guess, but my first thought was that the actual pinhole was
>>>> behind the visible 5mm or so hole. I wouldn't think you could get the
>>>> level of sharpness seen in the samples with a 5mm hole.
>>>>
>>>>> Nice idea, but I'll still have to find one of my body caps, maybe I should just buy a box of
10 and have done with it !
>>>>>
>>>>> I'm hoping to find some hidden where the other socks of the pair have gone.
>>>>>     
>>>>>
>>>>>
>>>>>>
>>>>>> Don't forget the gallery and the howto on the making and use of your own
>>>>>> test target. While you're there...
>>>>>> -- 
>>>>>> teleportation kills
>>>>>
>>>>
>>>>
>>>> -- 
>>>> Ken Hart
>>>> kwhart1@frontier.com
>>>
>>> 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.
>>
>>
>> -- 
>> PeterN
> 
> Yes, the hole should be round with a knife or near knife-edge.  Boring a hole in a thick material
causes more problems.
> 
Not if it's done right.

-- 
PeterN