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/
