In article ,
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-pinho...w-kickstarter-
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


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