{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.imatest.com/schema/25-1/rings-settings-target",
  "title": "Concentric Ring FOV: Target Settings",
  "description": "The user-provided settings describing the target properties.",
  "type": "object",
  "properties": {
    "type": {
      "description": "The user-provided method for describing the target.",
      "type": "string",
      "enum": [
        "Constant Angle",
        "Constant Distance",
        "IMA-FOV-1X"
      ]
    },
    "fov_of_first_ring_deg": {
      "description": "The field of view (in degrees) that corresponds to the first (innermost) ring at the nominal test distance.",
      "type": "number"
    },
    "ring_separation_angle_deg": {
      "description": "The angle (in degrees) between rings.",
      "type": "number"
    },
    "nominal_test_distance_mm": {
      "description": "The test distance in mm that the chart is designed to be used.",
      "type": "number"
    },
    "start_distance_mm": {
      "description": "The distance in mm from the center of the chart to the first ring.",
      "type": "number"
    },
    "delta_distance_mm": {
      "description": "The distance in mm between rings.",
      "type": "number"
    }
  },
  "required": [
    "type"
  ],
  "unevaluatedProperties": false
}