Hello all,
I just finished a small article on measuring pinholes by
using a scanner,
here is a link to it: http://members.home.com/penate/diameter.html
Guillermo
--- G.Penate pen...@home.com wrote:
Probably some of you are already doing the following, but it just occurred
to me that a flat bed scanner can also be used to measure pinhole diameters.
I just measured succesfuly a 0.012 pinhole diameter. My scanner is an El
Cheappo UMAX scanner $60 and it
- Original Message -
From: Mike Keller mike.kel...@wvculture.org
I tried that but wasn't sure I did it right. Care to elaborate on how you
measured?
Sure, here is what you should do: Set your scanning to the highest optical
resolution (1200 in my case), scan the pinhole and then scan a
Sebastian,
It is true that pinholes do not distort perspective in themselves; the
pinhole's image is dependent upon the relationship of the point (pinhole) to
the plane of projection (film).
The distortion you are seeing, assuming that the pinhole is placed on the
perpendicular to a (flat,
What a dam... good idea!!!
thanks
andy
-Original Message-
From: pinhole-discussion-admin@p at ???
[mailto:pinhole-discussion-admin@p at ???]On Behalf Of G.Penate
Sent: Tuesday, September 12, 2000 1:30 PM
To: pinhole-discussion@p at ???
Subject: Re: [pinhole-discussion] where 2
I tried that but wasn't sure I did it right. Care to elaborate on how you
measured?
Michael Keller
|-Original Message-
|From: G.Penate [mailto:pen...@home.com]
|Sent: Tuesday, September 12, 2000 1:30 PM
|To: pinhole-discussion@p at ???
|Subject: Re: [pinhole-discussion] where 2
Probably some of you are already doing the following, but it just occurred
to me that a flat bed scanner can also be used to measure pinhole diameters.
I just measured succesfuly a 0.012 pinhole diameter. My scanner is an El
Cheappo UMAX scanner $60 and it was enough to do the job.
Guillermo
In a message dated 9/12/00 11:58:35 AM, pen...@home.com writes:
I get my needles from The Dollar store and they are very consistent from
where the tapering of tip starts to about where the needle's eye is (not that
it matters to me, tho, as I measure my pinholes and zone plates with a
By chance, I photographed a needle and projected it,
only to find it had 2 different angles of taper and
the diameter was different everywhere along the length
of the needle! Checked a lot more needles and found the
same thing. The question: where on the needle does the
diameter from the
On Tue, Sep 12, 2000, Kosinski Family wrote:
Pinhole wizards,
By chance, I photographed a needle and projected it, only to
find it had 2 different angles of taper and the diameter was
different everywhere along the length of the needle! Checked a
lot more needles and found the same
On Tue, Sep 12, 2000, Kosinski Family wrote:
Pinhole wizards,
By chance, I photographed a needle and projected it, only to
find it had 2 different angles of taper and the diameter was
different everywhere along the length of the needle! Checked a
lot more needles and found the same thing. The
Hi !
I've done some experiments with slits in front of my SLR.
It looks to me, that there is a difference between on slit and two
slits.
(that is contradicory to the experiments of Guillermo a few days ago)
The image, that is produced by two slits seem to be clearer/sharper.
(But this effekt
Hello !
In some books you can read that the pinhole makes no linear distortion
as a normal lens does ?
But the pictures of my super-wide angle pinhole camera (141°) are on the
edges very distorted !
(e.g. clouds , zoom-effekt )
What does linear mean ?
Thank you !
Sebastian
Pinhole wizards,
By chance, I photographed a needle and projected it, only to find it had 2
different angles of taper and the diameter was different everywhere along the
length of the needle! Checked a lot more needles and found the same thing. The
question: where on the needle does the
I'm not aware of any significant problems with the list at the
present. There were problems that affected a small number of people when I
converted the list last month, but things seem to have settled down. There
ARE some continuing problems with the Mailman web interface to the list,
both
I've noticed in the past that message quantity seems to ebb and surge on
this list. When there's a topic of interest under discussion, it's a feast.
But sometimes there's a famine, too.g
Michael Keller
--- garfinkeldes...@aol.com wrote:
Actually I also have experienced low pinhole related e mail so yes I
too am having these problems. Wendy
I haven't noted any problems.
george
=
Handmade Photographic Images
http://members.home.net/hmpi/
Jim,
I took a look at the pinhole discussion list and could not find your address
on it. Please go to
http://www.pairlist.net/mailman/listinfo/pinhole-discussion, and try to
subscribe again. If you are still having trouble contact me again.
James Kellar
Pinhole Discussion List Manager
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