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/
