Prism Tipped Borescope with Fixed 30° DoV The forward oblique, 30° direction-of-view (DoV) of Hawkeye Pro Slim Prism Borescopes deliver greater depth perception than either 0° or 90° DOV scopes. Additionally, the wide 70° field-of-view gives the viewer a much broader and more versatile view of the subject. The prism optics in Hawkeye borescopes represent our very latest optical design: great image quality at hundreds less than comparable scopes! With an Independent Focusing Ring this endoscope is superbly adapted for video inspection.