It is exciting to think you might get the chance to see a solar eclipse. There is a lot of danger in doing so unprotected. Particularly for photographers, both amateur and professional. Let’s clear this up right now. IT IS NOT SAFE TO VIEW THE SUN DIRECTLY FOR ANY LENGTH OF TIME WITHOUT PROTECTION! This includes eyes, cameras, telescopes etc. You must use solar filtering on cameras and eyes.
When the sun is completely obscured by the moon, for a minute or so, you can view and shoot unfiltered. AS SOON AS ANY PART OF THE SUN STARTS TO REAPPEAR, YOU MUST GO BACK BEHIND FILTERS. The sun’s light is too powerful for eyes and camera sensors. They can be damaged quickly, in seconds in fact.
REGULAR SUNGLASSES OFFER NO PROTECTION AGAINST DIRECT SUN VIEWING. Think welding glass. That is the beginning of appropriate safety levels.
IF YOU ARE NOT IN THE ZONE OF TOTALITY OF ECLIPSE, YOU WILL NOT BE ABLE TO VIEW UNFILTERED AT ANYTIME.
Here is a helpful website. https://eclipse2017.nasa.gov/safety
Look at the above picture, this is moments after the eclipse has happened, and the sun is reappearing. The light from just that arch can injure your eye.
This is the sun without the eclipse viewed through a safe filter.
If you are going to take pictures, you should order a sheet of solar filter now, and cover the front of the camera lens so you can shoot safely.
Educate yourself now, and safely view the eclipse. A few seconds of unfiltered light could cost you a lifetime of vision.