Re: leaving the shutter open


"Colyn" <jcg13@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:bs1p229uba04nloqr9sj8eb47jssqq247k@xxxxxxxxxx
On 30 Mar 2006 16:44:00 -0800, "bob" <fourbirds4@xxxxxxxxxxx> wrote:

I saw a very cool slide (not digital) that had a picture of the
movement of the stars over a twenty minute period of time. Suposedly
this was done by leaving the shutter on a camera open for twenty
minutes. How can i do this? If so how? (please note I have used very
few camera's in my life other than disposables!)

You will need several items. A camera with either a B or T setting on
the shutterspeed dial, tripod, and locking cable release.
Mount the camera with 50mm lens on the pod and point it in the general
direction of the stars, set the dial to B or T and with the cable
release screwed into the shutter button open the shutter and lock the
cable for the amount of time you want to expose the film.
Write down the film frame number, exposure time, etc and repeat again
using different apertures and exposure times. After getting your
slides processed you can pick out the one you feel is exposed to your
liking.
By writing down this information you can better learn exposure times
and lens apertures.

--
Colyn Goodson

http://www.colyngoodson.com

for a 20 minute exposure of the stars, you probably don't really need a
tripod....Just rest the camera on it's back on the ground, or on a table,
pointed up. Make sure there are no street lights or any other lights other
than star light in the view of the lens......


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