diff --git a/tests/conftest.py b/tests/conftest.py
index 9ad8ca0..c8b784e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -540,6 +540,24 @@ def ngi_xyz_opk_csv_file() -> Path:
     return root_path.joinpath('tests', 'data', 'io', 'ngi_xyz_opk.csv')
 
 
+@pytest.fixture(scope='session')
+def ngi_xyz_opk_radians_csv_file(ngi_xyz_opk_csv_file: Path, tmp_path_factory: pytest.TempPathFactory) -> Path:
+    """
+    Exterior parameters for NGI data in (easting, northing, altitude), (omega, phi, kappa) CSV format. Includes
+    a header and .proj file.  Angles in radians.
+    """
+    filename = tmp_path_factory.mktemp('data').joinpath('ngi_xyz_opk_radians.csv')
+    dialect = dict(delimiter=',', quotechar='"', quoting=csv.QUOTE_MINIMAL)
+    with open(ngi_xyz_opk_csv_file, 'r', newline=None) as rf, open(filename, 'w', newline='') as wf:
+        reader = csv.reader(rf, **dialect)
+        writer = csv.writer(wf, **dialect)
+        writer.writerow(next(iter(reader)))  # write header
+        for row in reader:
+            row[4:7] = np.radians(np.float64(row[4:7])).tolist()
+            writer.writerow(row)
+    return filename
+
+
 @pytest.fixture(scope='session')
 def odm_lla_rpy_csv_file() -> Path:
     """
diff --git a/tests/test_io.py b/tests/test_io.py
index ff6b6d3..84166b9 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -154,17 +154,11 @@ def test_read_exif_int_param_dewarp(odm_image_file: Path, odm_reconstruction_fil
     _validate_int_param_dict(int_param_dict)
 
 
-def test_read_exif_int_param_no_dewarp(xmp_no_dewarp_image_file: Path):
+@pytest.mark.parametrize('filename', ['exif_image_file', 'exif_no_focal_image_file', 'xmp_no_dewarp_image_file'])
+def test_read_exif_int_param_no_dewarp(filename: str, request: pytest.FixtureRequest):
     """ Test reading EXIF / XMP tag interior parameters from an image without the 'DewarpData' XMP tag. """
-    int_param_dict = io.read_exif_int_param(xmp_no_dewarp_image_file)
-    int_params = next(iter(int_param_dict.values()))
-    assert int_params.get('cam_type', None) == 'pinhole'
-    _validate_int_param_dict(int_param_dict)
-
-
-def test_read_exif_int_param_no_xmp(exif_image_file: Path):
-    """ Test reading EXIF interior parameters from an image with sensor size tags and no XMP tags. """
-    int_param_dict = io.read_exif_int_param(exif_image_file)
+    filename: Path = request.getfixturevalue(filename)
+    int_param_dict = io.read_exif_int_param(filename)
     int_params = next(iter(int_param_dict.values()))
     assert int_params.get('cam_type', None) == 'pinhole'
     _validate_int_param_dict(int_param_dict)
@@ -175,7 +169,8 @@ def test_read_exif_int_param_no_xmp(exif_image_file: Path):
 ])  # yapf: disable
 def test_read_exif_int_param_values(image_file: str, odm_reconstruction_file: Path, request: pytest.FixtureRequest):
     """
-    Test EXIF interior parameter values against those from OsfmReader for images with different tag combinations.
+    Test EXIF focal length and sensor size interior parameter values against those from OsfmReader for images with
+    different tag combinations.
     """
     # read EXIF and OpenSfM interior parameters
     image_file: Path = request.getfixturevalue(image_file)
@@ -328,6 +323,16 @@ def test_csv_reader_xyz_opk_values(odm_xyz_opk_csv_file: Path, odm_crs: str, odm
         assert test_ext_param['opk'] == pytest.approx(ref_ext_param['opk'], abs=1e-6)
 
 
+def test_csv_reader_xyz_opk_radians(ngi_xyz_opk_csv_file: Path, ngi_xyz_opk_radians_csv_file: Path, ngi_crs: str):
+    """
+    Test CsvReader(..., radians=True) by comparing exterior parameters from files with angles in degrees and
+    radians.
+    """
+    deg_reader = io.CsvReader(ngi_xyz_opk_csv_file, crs=ngi_crs)
+    rad_reader = io.CsvReader(ngi_xyz_opk_radians_csv_file, crs=ngi_crs, radians=True)
+    assert deg_reader.read_ext_param() == rad_reader.read_ext_param()
+
+
 def test_csv_reader_lla_rpy(
     odm_lla_rpy_csv_file: Path, odm_crs: str, odm_image_files: Tuple[Path, ...], odm_reconstruction_file: Path
 ):