Re: 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@pinhole.com
> [mailto:pinhole-discussion-admin@pinhole.com]On Behalf Of
> Joao Ribeiro
> Sent: Sunday, October 13, 2002 12:35 AM
> To: pinhole-discussion@pinhole.com
> 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@pinhole.com
> > [mailto:pinhole-discussion-admin@pinhole.com]On Behalf Of
> > DAVID WALTERS
> > Sent: Friday, October 11, 2002 11:29 AM
> > To: pinhole-discussion@pinhole.com
> > 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/waltee@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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>
Received on Wed Oct 16 17:17:06 2002