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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