This particular one I believe is a Krider's hawk which is a variant of the Red tail Hawk. It has the bars on the chest, but the head and tail are mostly white.
Joan captured a nice shot of a Red Tail Hawk in flight in December. Getting good crisp shots of birds in flight requires good lighting so that shutter speeds faster than 1/1000 of a second can be maintained.
This past weekend presented many opportunities with bright skies to find hawks out looking for food. One young hawk was so intent on his meal that he ignored me for quite some time while I was able to get some good pictures of him killing and then eating his crow.
After finishing his meal he flew to a perch to watch for more prospective meals. I normally use aperture priority and try to keep ISO at 500 or less to maintain crispness and to be able to control depth of field. At times-particularly for birds in flight I will use ISO 640 to 1000. However, one must make sure that they are using a camera that can produce good images at low noise levels with higher ISO ratings (Joan and I both use Nikon D300 bodies with Nikkor lenses). Using the histograms for each picture exposure can be adjusted to keep from blowing out highlights or underexposing shadows. Often in snow, the exposure is adjusted +.3 to +1.0 stops to keep the snow from looking gray. One has to be careful with birds like Hawks and Eagles that contain a fair amount of white feathers to ensure that the white is not overexposed.