For most people, it is natural when they bring the camera up to one eye, to close the other. In most situations where you may be taking a photograph, this works just fine. There are situations however where you may find it advantageous to keep both eyes open.
When photographing a subject where you are waiting for an event to occur, such as a baseball player about to hit the ball, there is a definite advantage to using both your eyes. Once you image is composed within your viewfinder, open your second eye. Through some practice, you will be able to see both what you have framed in your camera and also, through your other eye, what is happening outside your camera. In this case you might be able to see the pitcher wind up and release the pitch.
Keeping both eyes open can help prepare you to capture the best image you can.
I have mentioned in the past that I am a member of the Niagara Falls Camera Club, which in turn is a member club of the Niagara Frontier Regional Camera Clubs (NFRCC). The NFRCC holds an annual convention that is open to the public. This year we will be meeting the weekend of April 11, 12 and 13. If you live or will be in Western New York that week end, it is a great opportunity to hear some excellent speakers talk about photography. Our keynote speaker this year is George Lepp who is a wonderful nature photographer and a pioneer of digital photography. For more information visit http://www.nfrcc.org/convention.php
Until next time, happy shooting.