Recently in the Florida Everglades, I shot a series of images of this blue heron as it took off and landed. I was pleased to see this magnificent bird with its wings outstretched. In order to freeze motion of wildlife, I usually increase the ISO on my camera making the sensor more sensitive to light. That way, I can still get a good exposure with a very fast shutter speed of 1/1000 of a second. In this case, I increased the ISO to 2000, anticipating the bird’s flight. (I was just explaining this formula to my daughter who will be traveling to Africa to enjoy a safari in a few days.)
I also made a conscious choice for the f stop setting. A lens is usually at its sharpest in the mid-range (f/7.1 here), and the depth of field is forgiving — keeping the bird in focus for the split second between the time I focus and the shutter releases. Had I opened the lens aperture wide (to counter balance the fast shutter speed), it would have been very difficult to keep the flying bird in focus. You can see, the image is successful, as long as you don’t mind a little grain, resulting from the high ISO. I will share some of the other photos in the series in subsequent blog posts.