Re: 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" <koolish@bbn.com>
> Reply-To: pinhole-discussion@pinhole.com
> Date: Fri, 31 Aug 101 15:41:32 -0400 (EDT)
> To: pinhole-discussion@pinhole.com
> 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.
>
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Received on Fri Aug 31 23:08:55 2001