Re: [pinhole-discussion] 35 mm pinhole camera
Hi Zami, Sorry for the late reply. The pinholes are 55 mm f 166 with a pinhole diameter of about 0.33 mm and a 105 mm f 318. Actually I prefer zone plate 35 mm photography, I don't like 35 mm pinholes (At least I don't like mine). I'll keep using the 4x5 cameras with pinhole. I transformed the 35 mm pinholes into 2 new plastic lens to use with the camera. Now with this 35 mm camera and the extension bellows I am using 55 and 105 mm zone plates and 390, 210 and 150 mm plastic lens, one of them in even a composition of a positive and negative lens to give me a usable focal distance. Cheers Joao Zami Schwartzman wrote: > Joaothanks for your reply Did you try a pinhole with it ? I wander > whe hole size and focal lengt and what are the resultsZami > > -Original Message- > From: pinhole-discussion-admin@p at ??? > [mailto:pinhole-discussion-admin@p at ???]On Behalf Of > Joao Ribeiro > Sent: Sunday, October 13, 2002 12:35 AM > To: pinhole-discussion@p at ??? > Subject: Re: [pinhole-discussion] 35 mm pinhole camera > Hi Zami, > > I have an old Yashica XYZ, I don't really remember the > specs, but I found an adapter to use pentax thread lenses > with it (it transforms the bayonet into a thread). > I had some aluminum tubes made to fit this thread, so now it > is easy to change focal distances and/or transform from Zone > Plate to pinhole in no time. I even made a 300 mm plastic > lens with an old pentax extension bellows, the aluminum tube > and some black tape and it is working pretty well. > Cheers > Joao > > Zami Schwartzman wrote: > > > Anyone has tried converting a 35 mm camera to pinhole ? > > > > I have modified an old Pentax Spotmatics Reflex camera , > > the idea was that > > using a 35 mm format will make it easier to experiment > > with various types of > > films . film drive , sutter timing , tripod attachement > > and release cable > > are already there and any local photo shop will process > > the films for me . > > I turned a "lens" boby on my lath that allows the metal > > foil be located 28 > > mm from the film . > > I discovered that with this camera I can flip the mirror > > up permanently > > without disabling other camera functions ( except for the > > viewfinder that > > obviously is shut off ) > > > > I use 0.02 mm copper foil .The pinhole was made under a > > x70 stereo > > microscope by using a very sharp pin ( honed under the > > microscope ) on hard > > back surface . > > the buurs on the oposit side had to be very carefuly > > treated with no. 400 > > sandpaper to get a perfect hole . Although not a sraight > > forward job , I can > > get perfect holes as small as 0.05 mm diameter ( I have > > scale on the > > microscope ) . there is no chance to get any smaller with > > manual pin > > puncturing tecniques . > > > > I experimented with a 0.1 mm hole , got some good close up > > pictures well > > exposed with Kodak gold 400 ASA( using f: 120 on the light > > meter ) but the > > results are quite " out of focus " on 10x15 prints . > > > > I wander if going further to a 0.05 hole will worth the > > panelty in the f > > number . > > Is there an optimun hole size for best sharpness ? or > > is it the smaller > > the better . > > > > I hear that some people are converting plastic 35 mm > > cameras , I wander > > what holes they use and how sharp is the resultant image > > they get . > > > > Zami > > > > -Original Message- > > From: pinhole-discussion-admin@p at ??? > > [mailto:pinhole-discussion-admin@p at ???]On Behalf Of > > DAVID WALTERS > > Sent: Friday, October 11, 2002 11:29 AM > > To: pinhole-discussion@p at ??? > > Subject: [pinhole-discussion] Re: New to the list and > > saying "hello" > > > > Evening, I apologize for the lag time on answering but > > I had a brief episode of file overload while trying to > > upload some pics (Sorry and thanks, Gregg). I have a > > pinhole from my last roll posted at > > > > http://photos.yahoo.com/bc/wal...@prodigy.net/lst?.dir=/Photo+art&.src=ph&;. > > > &
RE: [pinhole-discussion] 35 mm pinhole camera
Joao
thanks for your reply
Did you try a pinhole with it ? I wander whe hole size and focal lengt and
what are the results
Zami
-Original Message-
From: pinhole-discussion-admin@p at ???
[mailto:pinhole-discussion-admin@p at ???]On Behalf Of Joao Ribeiro
Sent: Sunday, October 13, 2002 12:35 AM
To: pinhole-discussion@p at ???
Subject: Re: [pinhole-discussion] 35 mm pinhole camera
Hi Zami,
I have an old Yashica XYZ, I don't really remember the specs, but I found
an adapter to use pentax thread lenses with it (it transforms the bayonet
into a thread).
I had some aluminum tubes made to fit this thread, so now it is easy to
change focal distances and/or transform from Zone Plate to pinhole in no
time. I even made a 300 mm plastic lens with an old pentax extension
bellows, the aluminum tube and some black tape and it is working pretty
well.
Cheers
Joao
Zami Schwartzman wrote:
Anyone has tried converting a 35 mm camera to pinhole ?
I have modified an old Pentax Spotmatics Reflex camera , the idea was
that
using a 35 mm format will make it easier to experiment with various
types of
films . film drive , sutter timing , tripod attachement and release
cable
are already there and any local photo shop will process the films for
me .
I turned a "lens" boby on my lath that allows the metal foil be located
28
mm from the film .
I discovered that with this camera I can flip the mirror up
permanently
without disabling other camera functions ( except for the viewfinder
that
obviously is shut off )
I use 0.02 mm copper foil .The pinhole was made under a x70 stereo
microscope by using a very sharp pin ( honed under the microscope ) on
hard
back surface .
the buurs on the oposit side had to be very carefuly treated with no.
400
sandpaper to get a perfect hole . Although not a sraight forward job , I
can
get perfect holes as small as 0.05 mm diameter ( I have scale on the
microscope ) . there is no chance to get any smaller with manual pin
puncturing tecniques .
I experimented with a 0.1 mm hole , got some good close up pictures well
exposed with Kodak gold 400 ASA( using f: 120 on the light meter ) but
the
results are quite " out of focus " on 10x15 prints .
I wander if going further to a 0.05 hole will worth the panelty in the
f
number .
Is there an optimun hole size for best sharpness ? or is it the
smaller
the better .
I hear that some people are converting plastic 35 mm cameras , I wander
what holes they use and how sharp is the resultant image they get .
Zami
-Original Message-
From: pinhole-discussion-admin@p at ???
[mailto:pinhole-discussion-admin@p at ???]On Behalf Of DAVID WALTERS
Sent: Friday, October 11, 2002 11:29 AM
To: pinhole-discussion@p at ???
Subject: [pinhole-discussion] Re: New to the list and saying "hello"
Evening, I apologize for the lag time on answering but
I had a brief episode of file overload while trying to
upload some pics (Sorry and thanks, Gregg). I have a
pinhole from my last roll posted at
"http://photos.yahoo.com/bc/wal...@prodigy.net/lst?.dir=/Photo+art&.src=ph&;.
order=&.view=t&.done=http%3a//photos.yahoo.com/"
("badge"), along with some other pieces of mine. The
body cap is on my Canon EOS, I measured the distance
at 49 mm and I'm using a laser drilled opening of
.0102", this gives an f/stop of 163, I reckon. Using
the bulb setting has given me fairly good results with
Kodak film, although it seems to be able to meter
through the pinhole. The Polaroid pinholes are from a
Polaroid 210 with a hand drilled pinhole, I had such a
bad rolloff because of reciprocity that I have stuck
with B/W since. I might go back to color with the 210
and stick to extreme sun in the future, we'll see.
Thanks for the welcome, David Walters
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Re: [pinhole-discussion] 35 mm pinhole camera
Hi Zami,
I have an old Yashica XYZ, I don't really remember the specs, but I found an
adapter to use pentax thread lenses with it (it transforms the bayonet into a
thread).
I had some aluminum tubes made to fit this thread, so now it is easy to change
focal distances and/or transform from Zone Plate to pinhole in no time. I even
made a 300 mm plastic lens with an old pentax extension bellows, the aluminum
tube and some black tape and it is working pretty well.
Cheers
Joao
Zami Schwartzman wrote:
> Anyone has tried converting a 35 mm camera to pinhole ?
>
> I have modified an old Pentax Spotmatics Reflex camera , the idea was that
> using a 35 mm format will make it easier to experiment with various types of
> films . film drive , sutter timing , tripod attachement and release cable
> are already there and any local photo shop will process the films for me .
> I turned a "lens" boby on my lath that allows the metal foil be located 28
> mm from the film .
> I discovered that with this camera I can flip the mirror up permanently
> without disabling other camera functions ( except for the viewfinder that
> obviously is shut off )
>
> I use 0.02 mm copper foil .The pinhole was made under a x70 stereo
> microscope by using a very sharp pin ( honed under the microscope ) on hard
> back surface .
> the buurs on the oposit side had to be very carefuly treated with no. 400
> sandpaper to get a perfect hole . Although not a sraight forward job , I can
> get perfect holes as small as 0.05 mm diameter ( I have scale on the
> microscope ) . there is no chance to get any smaller with manual pin
> puncturing tecniques .
>
> I experimented with a 0.1 mm hole , got some good close up pictures well
> exposed with Kodak gold 400 ASA( using f: 120 on the light meter ) but the
> results are quite " out of focus " on 10x15 prints .
>
> I wander if going further to a 0.05 hole will worth the panelty in the f
> number .
> Is there an optimun hole size for best sharpness ? or is it the smaller
> the better .
>
> I hear that some people are converting plastic 35 mm cameras , I wander
> what holes they use and how sharp is the resultant image they get .
>
> Zami
>
> -Original Message-
> From: pinhole-discussion-admin@p at ???
> [mailto:pinhole-discussion-admin@p at ???]On Behalf Of DAVID WALTERS
> Sent: Friday, October 11, 2002 11:29 AM
> To: pinhole-discussion@p at ???
> Subject: [pinhole-discussion] Re: New to the list and saying "hello"
>
> Evening, I apologize for the lag time on answering but
> I had a brief episode of file overload while trying to
> upload some pics (Sorry and thanks, Gregg). I have a
> pinhole from my last roll posted at
> "http://photos.yahoo.com/bc/wal...@prodigy.net/lst?.dir=/Photo+art&.src=ph&;.
> order=&.view=t&.done=http%3a//photos.yahoo.com/"
> ("badge"), along with some other pieces of mine. The
> body cap is on my Canon EOS, I measured the distance
> at 49 mm and I'm using a laser drilled opening of
> .0102", this gives an f/stop of 163, I reckon. Using
> the bulb setting has given me fairly good results with
> Kodak film, although it seems to be able to meter
> through the pinhole. The Polaroid pinholes are from a
> Polaroid 210 with a hand drilled pinhole, I had such a
> bad rolloff because of reciprocity that I have stuck
> with B/W since. I might go back to color with the 210
> and stick to extreme sun in the future, we'll see.
> Thanks for the welcome, David Walters
>
> ___
> Post to the list as PLAIN TEXT only - no HTML
> Pinhole-Discussion mailing list
> Pinhole-Discussion@p at ???
> unsubscribe or change your account at
> http://www.???/discussion/
>
> ___
> Post to the list as PLAIN TEXT only - no HTML
> Pinhole-Discussion mailing list
> Pinhole-Discussion@p at ???
> unsubscribe or change your account at
> http://www.???/discussion/
Re: [pinhole-discussion] 35 mm pinhole camera
- Original Message - From: "Zami Schwartzman" > the buurs on the oposit side had to be very carefuly treated with no. 400 > sandpaper to get a perfect hole . Although not a sraight forward job , I can > get perfect holes as small as 0.05 mm diameter FYI, such small pinhole would be "optimum" for a camera with a 1.85mm focal length!! A bit impractical, if you ask me!! > I experimented with a 0.1 mm hole , got some good close up pictures well > exposed with Kodak gold 400 ASA( using f: 120 on the light meter ) but the > results are quite " out of focus " on 10x15 prints . -Your f/stop should be f/280 and not f/120. -f/stop is given by dividing the focal length by the pinhole diameter (28/0.1 = 280) -As pointed out by erick...@hickorytech.net, you should be using a pinhole 0.00784" which is equivalent to 0.2mm. The 0.1mm pinhole is producing too much diffraction. -If you want relatively "sharp" 10x15 size results, I would suggest you shoot medium format or larger. > I wander if going further to a 0.05 hole will worth the panelty in the f > number . Only if you could mount that pinhole about 2mm from the film plane. The resulting image, BTW, would be a circular image no bigger than some 10mm in diameter. > Is there an optimun hole size for best sharpness ? or is it the smaller > the better. Take a look to this http://members.rogers.com/penate/pinsize.htm Guillermo
Re: [pinhole-discussion] 35 mm pinhole camera
Yes, there is a pinhole diameter that will give best sharpness for each
distance from pinhole to film. The simplest version of the formula is
(distance to film in inches)(55) equals the square of the optimal diameter
in thousandths of an inch. In your case (1.12 inches)(55) equals 68.99, the
square root of which is 7.84 thousandths, or 0.00784 inches.- Original
Message -
From: "Zami Schwartzman"
To:
Sent: Saturday, October 12, 2002 2:28 AM
Subject: [pinhole-discussion] 35 mm pinhole camera
> Anyone has tried converting a 35 mm camera to pinhole ?
>
> I have modified an old Pentax Spotmatics Reflex camera , the idea was
that
> using a 35 mm format will make it easier to experiment with various types
of
> films . film drive , sutter timing , tripod attachement and release cable
> are already there and any local photo shop will process the films for me
.
> I turned a "lens" boby on my lath that allows the metal foil be located 28
> mm from the film .
> I discovered that with this camera I can flip the mirror up permanently
> without disabling other camera functions ( except for the viewfinder that
> obviously is shut off )
>
> I use 0.02 mm copper foil .The pinhole was made under a x70 stereo
> microscope by using a very sharp pin ( honed under the microscope ) on
hard
> back surface .
> the buurs on the oposit side had to be very carefuly treated with no. 400
> sandpaper to get a perfect hole . Although not a sraight forward job , I
can
> get perfect holes as small as 0.05 mm diameter ( I have scale on the
> microscope ) . there is no chance to get any smaller with manual pin
> puncturing tecniques .
>
> I experimented with a 0.1 mm hole , got some good close up pictures well
> exposed with Kodak gold 400 ASA( using f: 120 on the light meter ) but the
> results are quite " out of focus " on 10x15 prints .
>
> I wander if going further to a 0.05 hole will worth the panelty in the f
> number .
> Is there an optimun hole size for best sharpness ? or is it the smaller
> the better .
>
> I hear that some people are converting plastic 35 mm cameras , I wander
> what holes they use and how sharp is the resultant image they get .
>
> Zami
>
>
>
>
> -Original Message-
> From: pinhole-discussion-admin@p at ???
> [mailto:pinhole-discussion-admin@p at ???]On Behalf Of DAVID WALTERS
> Sent: Friday, October 11, 2002 11:29 AM
> To: pinhole-discussion@p at ???
> Subject: [pinhole-discussion] Re: New to the list and saying "hello"
>
>
> Evening, I apologize for the lag time on answering but
> I had a brief episode of file overload while trying to
> upload some pics (Sorry and thanks, Gregg). I have a
> pinhole from my last roll posted at
>
"http://photos.yahoo.com/bc/wal...@prodigy.net/lst?.dir=/Photo+art&.src=ph&;.
> order=&.view=t&.done=http%3a//photos.yahoo.com/"
> ("badge"), along with some other pieces of mine. The
> body cap is on my Canon EOS, I measured the distance
> at 49 mm and I'm using a laser drilled opening of
> .0102", this gives an f/stop of 163, I reckon. Using
> the bulb setting has given me fairly good results with
> Kodak film, although it seems to be able to meter
> through the pinhole. The Polaroid pinholes are from a
> Polaroid 210 with a hand drilled pinhole, I had such a
> bad rolloff because of reciprocity that I have stuck
> with B/W since. I might go back to color with the 210
> and stick to extreme sun in the future, we'll see.
> Thanks for the welcome, David Walters
>
> ___
> Post to the list as PLAIN TEXT only - no HTML
> Pinhole-Discussion mailing list
> Pinhole-Discussion@p at ???
> unsubscribe or change your account at
> http://www.???/discussion/
>
>
>
> ___
> Post to the list as PLAIN TEXT only - no HTML
> Pinhole-Discussion mailing list
> Pinhole-Discussion@p at ???
> unsubscribe or change your account at
> http://www.???/discussion/
>
