Hi, I'm new on this list and started few months ago with pinhole photography. It all started when I came along www.pinhole.cz and tried 'pinholedesigner' v2 which is a small program, very usefull for building your own camera's. It'as also free for download, so it's worth giving it a try. (and it's in english, so is the site)
This program offers: - calculation of the optimal diameter of the pinhole - calculation of the optimal focal length - calculation of the f number for a given combination of pinhole and focal length - calculation of the exposure factor for f 22 - calculation of the exposure times for a given f number of the pinhole camera - calculation of the extended exposure times due to reciprocity failure for the majority of commonly used films - saving exposure table as Microsoft Excel file or text file - calculation of the angle of view, with diagram - calculation of the magnification and size of the subject on light-sensitive material - calculation of the zone plate with optional number of zones - calculation of the f number for the zone plate - saving the zone plate in Adobe PDF format - conversion of millimetres to inches and back ...And there is much more on that site like the building plans of the dirkon, which is a fully paper camera. I've build it and it effectively works well. Cosyns Xavier, > -----Original Message----- > From: pinhole-discussion-admin@p at ??????? > [mailto:pinhole-discussion-admin@p at ???????] On Behalf Of Front3031 > Sent: lundi 13 octobre 2003 3:09 > To: pinhole-discussion@p at ??????? > Subject: Re: [pinhole-discussion] small apertures > > > John, > I've been working (slowly) on my own camera as well. I've > found the following page pretty helpful in creating the > design I am developing: > > http://www.mrp at ???????/ > > There are a number of calculators for focal length, exposure, > and pinhole diameter. > > Hope that helps a little, > Doug > > > > ----- Original Message ----- > From: "John Aengus Burke" <john_aengu...@hotmail.com> > To: <Pinhole-Discussion@p at ???????> > Sent: Sunday, October 12, 2003 7:48 PM > Subject: [pinhole-discussion] small apertures > > > > Hello > > I have recently constructed a pinhole camera from hardwood. > Apart from > > certain teething problems I am most concerned about the fstop of my > camera. > > In order to be able to guarnetee getting a sharp image I got a > > jeweller friend of mine to drill a beautiful hole in a > piece of thin > > metal for me > and > > the camera has an adjustable bellows to allow me get the optimium > > focal length by trial and error. I haven't taken it out for a trail > > run yet because I haven't had access to a darkroom for a while. > > However that aside > I > > am worried about the size of the pinhole. My focal length is roughly > 12.5cm > > and the pinhole is between approx.0.5 - 0.8mm from what I > can tell. I > > am worried about diffraction and also exposure time. Now > given I will > > be exposing onto 120 film I don't expect to be waiting all day but > > still I would be grateful if anybody has any suggestions. > Do you think > > the pinhole is too small? And given its size, as it seem sto me the > > projected image would be extremely small on the focal plain, do you > > agree? John Burke, Ireland. > > > > _________________________________________________________________ > > MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. > > http://join.msn.com/?page=features/virus > > > > > > _______________________________________________ > > 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/ > >
