Note eyes touching in midline = male; body colour and wing pattern diagnostic for species. Guide Page to follow.
The 'trick' to photographing tabanids (and other flies) if you cannot get a field shot is to collect the fly alive and offer it a drop of sugar water on a suitable background. Most insects taste with their feet, particularly the front tarsi, and once they contact the sugar drop they will keep still and begin to feed - through the mouth! Set up the camera and get everything ready before placing the fly near the sugar; feeding may be as short as 1 minute. The insect can then be released.