> 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.
