Angle finder c 90 viewfinder

The images used in this report were taken using a digital single lens reflex (DSLR) camera mounted on a Kaiser RS1 copy stand. The DSLR was a Canon EOS 700D which was fitted with a Canon Angle Finder C 90° viewfinder with a 1.25-2.5x optical magnification and a Canon TC-80N3 remote control external shutter release to avoid camera motion. Images were taken using two sizes of macro lenses-a 50mm lens for overview shots of the substrates and a 100mm lens for high magnification macro shots of individual fingerprints. The lenses used were a Canon EF 50mm f2.5 macro lens and a Canon EF 100mm f2.8L macro IS USM lens. Substrates were lit using oblique lighting from two Daylight Twist Portable Lamps with a white light output of 6500K. Images were captured in aperture priority mode with an aperture of f/8 to ensure clarity of focus across the whole fingerprint and an ISO between 100 and 400 to minimise noise or grain in the images. The lighting setup in combination with the selected DSLR camera settings were determined in preliminary studies where clear second level ridge detail could be observed. DSLR images were saved onto a SanDisk 16GB memory card and transferred to a PC for grading.

The images used in this report were taken using a digital single lens reflex (DSLR) camera mounted on a Kaiser RS1 copy stand. The DSLR was a Canon EOS 700D which was fitted with a Canon Angle Finder C 90° viewfinder with a 1.25-2.5x optical magnification and a Canon TC-80N3 remote control external shutter release to avoid camera motion. Images were taken using two sizes of macro lenses-a 50mm lens for overview shots of the substrates and a 100mm lens for high magnification macro shots of individual fingerprints. The 50mm lens was used as it is recognised as being generally equivalent to the view seen by the human eye [10] . The lenses used were a Canon EF 50mm f2.5 macro lens and a Canon EF 100mm f2.8L macro IS USM lens. Substrates were lit using oblique lighting from two Daylight Twist Portable Lamps with a white light output of 6500K. Images were captured in aperture priority mode with an aperture of f/8 to ensure clarity of focus across the whole fingerprint and an ISO between 100 and 400 to minimise noise or grain in the images. The lighting setup in combination with the selected DSLR camera settings were determined in preliminary studies where clear second level ridge detail could be observed. DSLR images were saved onto a SanDisk 16GB memory card and transferred to a PC for grading.