What is the best angle for Type 4 fingerprints?

• A. Thirty-degree angle
• B. Forty-five-degree angle
• C. Sixty-degree angle
• D. Ninety-degree angle

Answer: (B)

The idea behind the best angle is to get a view that preserves ridge details without introducing distortion. An oblique view around 45 degrees gives a balanced perspective: you still see the true shape and spacing of the ridges, including important minutiae like ridge endings and bifurcations, while avoiding the excessive foreshortening that happens when you shoot too shallow (30 degrees) or the compression and possible glare that can occur at steeper angles (60 or 90 degrees). A 45-degree angle tends to produce even ridge representation across the print, which helps analysts compare features accurately and maintain consistent measurements.