You might also look at a recent isue of Pinhole Journal which features work by Dominique Stroobant, who also did a lot of work with long exposures over several months of the course of the sun. ----- Original Message ----- From: "R Duarte" <ra...@rahji.com> To: <pinhole-discussion@p at ???????> Sent: Friday, August 31, 2001 10:15 PM Subject: Re: [pinhole-discussion] very long exposure
> wow, that picture is amazing! check out eric renner's Pinhole Photography > book for some interesting pictures of the sky exposed over the course of 6 > months. Unfortunately I don't think he mentions much about how they were > technically accomplished. > > rob > > > From: "Richard M. Koolish" <kool...@bbn.com> > > Reply-To: pinhole-discussion@p at ??????? > > Date: Fri, 31 Aug 101 15:41:32 -0400 (EDT) > > To: pinhole-discussion@p at ??????? > > Subject: Re: [pinhole-discussion] very long exposure > > > >> I have the project to expose a color negative during one year with a > >> pinhole camera... > >> The picture should represent the trajectory of the sun from winter to > >> summer solstice and inversely and, I hope, a weird representation of > >> the landscape. > >> I'm thinking of using a ND 120 filter (-20 stops) to achieve that. > >> Does anyone has already experiment that kind of exposure with another > >> solution ? > >> > >> Hugues > >> > >> http://users.skynet.be/asveyou > > > > > > > > If you expose every day, you will probably get a wide band as the sun > > slowly changes declination from +23 degrees above the celestial equator in the > > summer to -23 degrees below the celestial equator in the winter. Each day > > would be a little exposed strip, and they would scan the negative something > > like the raster scan of a computer monitor. > > > > Look at the picture: http://sundials.org/links/local/pages/dicicco.htm > > > > It's a photo of the analemma, and was done by taking a picture of the sun > > at exactly the same time of day, once a week for a year. It shows the change > > in the suns declination and the equation of time, which is due to the sun > > being > > fast or slow with respect to the clock due to the tilt of the earths axis and > > the eccentricity of the earths orbit. That picture was taken on one piece of > > of 4x5 film with a Speed Graphic camera bolted to a window frame. I actually > > saw the camera in place during the second try to make the photograph. He used > > a newtral desnity filter over the lens, probably ND 5 (factor of 100,000). > > > > You probably want to try a shot test first, of perhaps a week. And > > remember that at the summer and winter solstices, the declination is changing > > very slowly, so the suns path will repeat for some number of days giving more > > exposure in the same place. > > > > _______________________________________________ > > Pinhole-Discussion mailing list > > Pinhole-Discussion@p at ??????? > > unsubscribe or change your account at > > http://www.???????/discussion/ > > > > > _______________________________________________ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ >
