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Re: Physicists teaching astronomy



Michael Edmiston wrote:

I have a nice picture of the planets taken with a 3.3 mega pixel digi=
tal camera. It appears at this URL...

http://www.bluffton.edu/~edmistonm/astronomy/

The file: five.planets.jpg is pretty much straight from the camera.

Although I am a camera novice, I was going to try and do a similar
photograph using only a simple auto-focus 35 mm (non-reflex)camera. By
disabling the flash, the instructions said I could get up to a 4 s exposure.
The "experts" said I needed, at least, 10 to 30 s exposure. I did see some
photos on the internet which used 20s. Clouds, and lack of a tripod,
prevented my attempt, so I never found out what would have happened at 4 s.

What exposure time was used for the above photos? Was a tripod used?

Don Polvani
Anne Arundel Community College
Arnold, MD