From: RichA <rander3128@gmail.com>
Subject: Re: "Pinhole S" on Kickstarter!
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Date: Sat, 18 Nov 2017 16:21:27 -0800 (PST)
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Subject: Re: "Pinhole S" on Kickstarter!
From: RichA <rander3128@gmail.com>
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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.