PHOTOGRAPHING A TOTAL ECLIPSE
To capture the feel of a total eclipse, some photographers use a camera with a wide-angle lens perched on a tripod and aimed where the Moon will be at mid-totality. The eclipsed Sun will be small in the frame, but the photo will catch the main ingredients of the scene: the Sun and Moon, the brighter planets and stars, the horizon glow, and the blurry silhouettes of observers.
Other photographers concentrate on the corona. With a camera piggybacked on a telescope and a 1,000 mm or 2,000 mm lens, you could take a long exposure, showing its maximum extent. Or you could make a series of exposures starting with short ones and running progressively longer to capture the corona in stages, from the brightest parts'near the lunar limb to the outer streamers. Another possibility is to photograph the eclipsed Sun through a telescope, perhaps using eyepiece projection for extra magnification. This will capture the pinkish prominences that reach above the lunar disk.
With any photo, the correct exposure time depends on the film speed and f-ratio. For ISO 100 film, try the following exposures.
- outer corona 1/2 second at f/8
- inner corona 1/15 second at f/8
- prominences 1/ 25 second at f/8
- diamond ring 1/500 second at f/8
- scenic shots 1/2 to 8 seconds at f/2.8