Color Optical Structure

8°/D (8° illumination, diffused viewing angle)

d/8 (diffused illumination, 8-degree viewing angle)

45/0 method (45 ring-shaped illumination, vertical viewing).

0/45° geometry spectrophotometers illuminate the sample at an angle of 90° while the detector views the sample at a 45° angle. 45/0° geometry illuminates the sample with a beam striking the sample at an angle of 45° while the detector views the sample at an angle of 90°. Many color technologists report that 0/45° or 45/0° geometry spectrophotometric and colorimetric data closely simulates the visual experience. This is advantageous when seeking to match or evaluate color samples thanks to the reported agreement with visual assessments. A distinct disadvantage to this geometry, however, is the inability to examine transparent and translucent samples.