Astronomy photography - Constellation Libra photo with description

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Constellation Libra

Kodak Pro 400 PPF - 6 x 7 cm Pentax medium format camera w/90mm lens

- Libra's name is Latin for "weighing scales" which is the shape that in ancient times these stars were thought for form. In this photo, the scales are tipped on their side.

The photo shows the main "naked eye" stars that make up the shape of the constellation enlarged in their true color. This is a natural photographic technique with the effect created during a single exposure of the film.

Our photographic technique was used that we call a "motion stop sequence" to get the long exposure of the constellation and a sharp exposure of the trees in the same photograph. The camera must accurately track the movement of the stars across the sky over the hour long exposure to keep them from smearing on the film. Then a new exposure is taken with the tracking drive turned off to capture the "Earth scene" and keep it from smearing on the film. Then the two are merged together so the final photograph shows both components clearly as they looked to the observer in "real time".

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