diff --git a/picamera2/configuration.py b/picamera2/configuration.py
index 7c6a3f2d..9c01794b 100644
--- a/picamera2/configuration.py
+++ b/picamera2/configuration.py
@@ -83,7 +83,7 @@ def align(self, optimal=True):
 
 
 class StreamConfiguration(Configuration):
-    _ALLOWED_FIELDS = ("size", "format", "stride", "framesize")
+    _ALLOWED_FIELDS = ("size", "format", "stride", "framesize", "preserve_ar")
     _FIELD_CLASS_MAP = {}
     _FORWARD_FIELDS = {}
 
diff --git a/picamera2/picamera2.py b/picamera2/picamera2.py
index d3117d37..72f57e42 100644
--- a/picamera2/picamera2.py
+++ b/picamera2/picamera2.py
@@ -655,7 +655,7 @@ def _make_initial_stream_config(stream_config: dict, updates: dict, ignore_list=
         """
         if updates is None:
             return None
-        valid = ("format", "size", "stride")
+        valid = ("format", "size", "stride", "preserve_ar")
         for key, value in updates.items():
             if isinstance(value, SensorFormat):
                 value = str(value)
@@ -692,9 +692,9 @@ def create_preview_configuration(self, main={}, lores=None, raw={}, transform=li
         if not self._is_rpi_camera():
             raw = None
             sensor = None
-        main = self._make_initial_stream_config({"format": "XBGR8888", "size": (640, 480)}, main)
+        main = self._make_initial_stream_config({"format": "XBGR8888", "size": (640, 480), "preserve_ar": True}, main)
         self.align_stream(main, optimal=False)
-        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"]}, lores)
+        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"], "preserve_ar": False}, lores)
         if lores is not None:
             self.align_stream(lores, optimal=False)
         raw = self._make_initial_stream_config({"format": self.sensor_format, "size": main["size"]},
@@ -726,9 +726,10 @@ def create_still_configuration(self, main={}, lores=None, raw={}, transform=libc
         if not self._is_rpi_camera():
             raw = None
             sensor = None
-        main = self._make_initial_stream_config({"format": "BGR888", "size": self.sensor_resolution}, main)
+        main = self._make_initial_stream_config({"format": "BGR888", "size": self.sensor_resolution, "preserve_ar": True},
+                                                main)
         self.align_stream(main, optimal=False)
-        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"]}, lores)
+        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"], "preserve_ar": False}, lores)
         if lores is not None:
             self.align_stream(lores, optimal=False)
         raw = self._make_initial_stream_config({"format": self.sensor_format, "size": main["size"]},
@@ -760,9 +761,9 @@ def create_video_configuration(self, main={}, lores=None, raw={}, transform=libc
         if not self._is_rpi_camera():
             raw = None
             sensor = None
-        main = self._make_initial_stream_config({"format": "XBGR8888", "size": (1280, 720)}, main)
+        main = self._make_initial_stream_config({"format": "XBGR8888", "size": (1280, 720), "preserve_ar": True}, main)
         self.align_stream(main, optimal=False)
-        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"]}, lores)
+        lores = self._make_initial_stream_config({"format": "YUV420", "size": main["size"], "preserve_ar": False}, lores)
         if lores is not None:
             self.align_stream(lores, optimal=False)
         raw = self._make_initial_stream_config({"format": self.sensor_format, "size": main["size"]},
@@ -1121,6 +1122,14 @@ def configure_(self, camera_config="preview") -> None:
         self.controls = Controls(self, controls=self.camera_config['controls'])
         self.configure_count += 1
 
+        if "ScalerCrops" in self.camera_controls:
+            par_crop = self.camera_controls["ScalerCrops"]
+            full_fov = self.camera_controls["ScalerCrop"][1]
+            scaler_crops = [par_crop[0] if camera_config["main"]["preserve_ar"] else full_fov]
+            if self.lores_index >= 0:
+                scaler_crops.append(par_crop[1] if camera_config["lores"]["preserve_ar"] else scaler_crops[0])
+            self.set_controls({"ScalerCrops": scaler_crops})
+
     def configure(self, camera_config="preview") -> None:
         """Configure the camera system with the given configuration."""
         self.configure_(camera_config)