Exceptional target practically measures Depth of Field to avoid errors by theroretical calculation. Determines how much shift objecs can tolerate before image degradation in Video/Optical systems. Also used to check Telecentricity.
Patterns include both horizontal and vertical rulings at 5 and 15 lp/mm. Between the ruling groups are accurate linear scales 50mm in length with 0.05mm divisions. Assembly dimensions: 34mmx57mmx57mm. High contrast film on Aluminum block with 45° or Planar viewing.