From: android <here@there.was>
Subject: Re: "Pinhole S" on Kickstarter!
Full headers:
Path: news.netfront.net!goblin3!goblin.stu.neva.ru!news-2.dfn.de!news.dfn.de!news.informatik.hu-berlin.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: android <here@there.was>
Newsgroups: rec.photo.digital
Subject: Re: "Pinhole S" on Kickstarter!
Date: Sat, 18 Nov 2017 16:12:39 +0100
Organization: the center
Lines: 57
Message-ID: <here-6850D6.16123918112017@news.individual.net>
References: <here-508BF6.14252617112017@news.individual.net> <5acc4765-01cc-4458-9bdc-841e181fa2f1@googlegroups.com> <oun176$tfv$1@gioia.aioe.org> <043f68f9-35b0-45e4-b669-499e40ff3768@googlegroups.com>
X-Trace: individual.net ByjO+Vr8RTlH2ImBvdzC0Asrsnc3HiscqMzmYKsVL9+6SUpXpb
X-Orig-Path: here
Cancel-Lock: sha1:02Y9pcsKd+g4zVrU0gnGyT9loYc=
User-Agent: MT-NewsWatcher/3.5.2 (Intel Mac OS X)
Print Article
Forward Article
In article<043f68f9-35b0-45e4-b669-499e40ff3768@googlegroups.com>,
 RichA<rander3128@gmail.com> 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 one I did measured to about 1/32 but that one was made with a pin in 
that mackerel can! Situated behind the 5mm hole in the bodycap. Maybe 
Ill try to make a smaller one another day but I believe that diffraction 
is relative the physical size of the aperture. So the same size of hole 
would give you about f/64 on a FF camera and so on...
-- 
teleportation kills