diff --git a/corrct/_projector_backends.py b/corrct/_projector_backends.py
index 15ef1c8..68639e0 100644
--- a/corrct/_projector_backends.py
+++ b/corrct/_projector_backends.py
@@ -126,7 +126,7 @@ def initialize_geometry(
         angles_rot_rad: Union[ArrayLike, NDArray],
         rot_axis_shift_pix: Union[ArrayLike, NDArray, None] = None,
         prj_geom: Optional[ProjectionGeometry] = None,
-        create_single_projs: bool = True,
+        create_single_projs: bool = False,
     ):
         """Initialize the projector geometry.
 
@@ -142,7 +142,7 @@ def initialize_geometry(
             The fully specified projection geometry.
             When active, the rotation axis shift is ignored. The default is None.
         create_single_projs : bool, optional
-            Whether to create projectors for single projections. Used for corrections and SART. The default is True.
+            Whether to create projectors for single projections. Used for corrections and SART. The default is False.
         """
         self.vol_geom = vol_geom
 
@@ -276,7 +276,7 @@ def initialize_geometry(
         angles_rot_rad: Union[ArrayLike, NDArray],
         rot_axis_shift_pix: Union[ArrayLike, NDArray, None] = None,
         prj_geom: Optional[ProjectionGeometry] = None,
-        create_single_projs: bool = True,
+        create_single_projs: bool = False,
     ):
         """Initialize projector backend based on scikit-image.
 
@@ -294,7 +294,7 @@ def initialize_geometry(
             When active, the rotation axis shift is ignored. The default is None.
             NOT SUPPORTED: if anything else than None is passed, it will throw an error!
         create_single_projs : bool, optional
-            Whether to create projectors for single projections. Used for corrections and SART. The default is True.
+            Whether to create projectors for single projections. Used for corrections and SART. The default is False.
 
         Raises
         ------
@@ -433,7 +433,7 @@ def initialize_geometry(
         angles_rot_rad: Union[ArrayLike, NDArray],
         rot_axis_shift_pix: Union[ArrayLike, NDArray, None] = None,
         prj_geom: Optional[ProjectionGeometry] = None,
-        create_single_projs: bool = True,
+        create_single_projs: bool = False,
     ):
         """Initialize geometry of projector backend based on astra-toolbox.
 
@@ -449,7 +449,7 @@ def initialize_geometry(
             The fully specified projection geometry.
             When active, the rotation axis shift is ignored. The default is None.
         create_single_projs : bool, optional
-            Whether to create projectors for single projections. Used for corrections and SART. The default is True.
+            Whether to create projectors for single projections. Used for corrections and SART. The default is False.
 
         Raises
         ------
@@ -753,7 +753,7 @@ def initialize_geometry(
         angles_rot_rad: Union[ArrayLike, NDArray],
         rot_axis_shift_pix: Union[ArrayLike, NDArray, None] = None,
         prj_geom: Optional[ProjectionGeometry] = None,
-        create_single_projs: bool = True,
+        create_single_projs: bool = False,
     ):
         """Initialize projector backend based on experimental astra-toolbox functions.
 
@@ -769,7 +769,7 @@ def initialize_geometry(
             The fully specified projection geometry.
             When active, the rotation axis shift is ignored. The default is None.
         create_single_projs : bool, optional
-            Whether to create projectors for single projections. Used for corrections and SART. The default is True.
+            Whether to create projectors for single projections. Used for corrections and SART. The default is False.
 
         Raises
         ------
diff --git a/corrct/projectors.py b/corrct/projectors.py
index b705cd9..5248b55 100755
--- a/corrct/projectors.py
+++ b/corrct/projectors.py
@@ -124,7 +124,7 @@ def __init__(
         prj_intensities: Optional[ArrayLike] = None,
         psf: Optional[ArrayLike] = None,
         backend: Union[str, prj_backends.ProjectorBackend] = "astra" if astra_available else "skimage",
-        create_single_projs: bool = True,
+        create_single_projs: bool = False,
     ):
         """Initialize the base projection class.
 
@@ -152,7 +152,7 @@ def __init__(
             The default is True if CUDA and ASTRA are available, otherwise False.
         create_single_projs : bool, optional
             Whether to create projectors for single projections.
-            Used for corrections and SART, by default True.
+            Used for corrections and SART, by default False.
 
         Raises
         ------
@@ -168,7 +168,7 @@ def __init__(
                 raise ValueError(f"Passed ASTRA projector, but astra not available ({astra_status}).")
 
         if not isinstance(vol_geom, models.VolumeGeometry):
-            vol_geom = models.VolumeGeometry(vol_shape_xyz=np.array(vol_geom))
+            vol_geom = models.VolumeGeometry(_vol_shape_xyz=np.array(vol_geom))
         self.vol_geom = vol_geom
 
         if not len(self.vol_geom.shape_xyz) in (2, 3):
@@ -448,6 +448,7 @@ def __init__(
             psf=psf,
             prj_intensities=prj_intensities,
             backend=backend,
+            create_single_projs=True,
         )
 
         self.data_type = data_type