- Original Message -
From: G.Penate pen...@home.com
To: pinhole-discussion@p at ???
Sent: Wednesday, February 28, 2001 6:55 PM
Paper or film won't bend around a tight sphere, only a cylinder.
Some months ago, I tried to build a small spherical film plane camera around
a tennis
- Original Message -
From: Richard M. Koolish kool...@bbn.com
A spherical film plane would eliminate one of the cosine squared
factors in
illumination, but leave the other one.
That's right, it eliminates the one COS^2 factor to account for inverse
square law, also eliminates
A spherical shaped film plane would be ideal to maximize the edge
sharpness, I guess I should say: to minimize edge softness (instead), as
well as minimizing the fall-off. Practically, though, cylindrical is the
shape most suitable to accomodate either film or paper. I believe that in
one
I think I've seen this, but can't remember where.
Pam
G.Penate wrote:
... there is a picture
of a guy that made a spherical film plate dug in the ground and BW paper
placed to conform the shape of the hole.
Guillermo
___
Pinhole-Discussion
equally sharp all the way around.
- Original Message -
From: Pam Niedermayer pam_p...@cape.com
To: pinhole-discussion@p at ???
Sent: Tuesday, February 27, 2001 2:51 PM
Subject: Re: [pinhole-discussion] couple of pictures
How spherical would the film plane have to be to get
this there is
minimal distortion at the edges and its equally sharp all the way around.
- Original Message -
From: Pam Niedermayer pam_p...@cape.com
To: pinhole-discussion@p at ???
Sent: Tuesday, February 27, 2001 2:51 PM
Subject: Re: [pinhole-discussion] couple of pictures
How spherical would
- Original Message -
From: Pam Niedermayer pam_p...@cape.com
This means the spherically shaped film
holder would have to be different for each focal length. Ouch. :)
A spherical shaped film plane would be ideal to maximize the edge
sharpness, I guess I should say: to minimize edge
Thanks, George, that's what I was trying to confirm. I should have
said something more like the distance from pinhole to film plane would
be the radius of the sphere. This means the spherically shaped film
holder would have to be different for each focal length. Ouch. :)
Pam
George L Smyth
--- Pam Niedermayer pam_p...@cape.com wrote:
How spherical would the film plane have to be to get to sharp edges?
Let's say I'm building an 8x10 pinhole camera (which I am), and wanted
to build a special curved film holder. Should the spere be around the
distance from pinhole to film center,
How spherical would the film plane have to be to get to sharp edges?
Let's say I'm building an 8x10 pinhole camera (which I am), and wanted
to build a special curved film holder. Should the spere be around the
distance from pinhole to film center, the pinhole being the center of
the sphere?
Pam
I'd guess that edge softness is a product of the fact that the plane of
optimal sharpness is a hemisphere centered aroiund the hole, and the film
plane is flat, transecting the optimal image best at the center, or if
rounded, not rounded at the same radius.
- Original Message -
From: Simon
- Original Message -
From: Simon Cygielski si...@wbj.pl
I've uploaded a couple of my first efforts with my 6x17 cm panoramic
pinhole camera. They're up at
http://www.p at ???/discussion/upload/images/path1.jpg and
http://www.p at ???/discussion/upload/images/phones2.jpg
Wow,
Very cool. As to edge sharpness, is the film supported all the way
across by rails of some sort? Is it possible that in building the
extension the ends went off plane? Or (can you tell I'm just guessing
here? g) maybe the rails need to be curved just a bit to accommodate
the hole.
Pam
Simon
--- Simon Cygielski si...@wbj.pl wrote:
I also have a question: is the loss of sharpness on the far edges
inevitable, or can it be corrected somehow? perhaps thinner stock? This
hole was made (fairly carefully) out of a Coke can
I would definitely say that thinner stock would be appropriate.
on 2/27/01 4:56 AM, Simon Cygielski at si...@wbj.pl wrote:
Hi all,
I've uploaded a couple of my first efforts with my 6x17 cm panoramic
pinhole camera. They're up at
http://www.p at ???/discussion/upload/images/path1.jpg and
http://www.p at ???/discussion/upload/images/phones2.jpg
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