Absolutely a very timely article from Nikon on How To Photograph a Solar Eclipse. The photo on the left gives you a written sheet on exposure guides for an eclipse. Here is an excerpt from the article listed.
“Whereas lunar eclipses are safe to view with the naked eye, solar eclipses are not. You must take the necessary precautions to keep from harming your eyesight. In fact, you also need to use a “solar filter” to keep from harming your camera’s imaging sensor as well as for correct exposure.
A solar eclipse occurs whenever the moon’s shadow falls on Earth. This can only occur during a new moon, when the moon passes between the sun and Earth. There are two or more solar eclipses a year; which occur when the geometry lines up just right, so that part of the moon’s shadow falls on Earth’s surface and an eclipse of the sun is seen from that region …. You can find information on solar filters and where to purchase them from astronomy websites and magazines. Safe solar filters for cameras and telescopes are available as either “Full-Aperture” and “Off-Axis” filters. Both of these filters fit over the objective (front end of the telescope) or camera lens.
Full-aperture solar filters are the preferred filters of choice. This is because the filter completely covers the front of the telescope so the entire mirror or lens is used. No refocusing of the telescope or camera lens will be needed when you remove the filter at the beginning of totality or when it is replaced back on the telescope/camera lens at the end of the total phase.”
You may also want to look at NASA’s information page on Solar Eclipses. Enjoy and take the safety precautions. You might miss the shot this time, but you’ll be able to see another one!