diff --git a/src/openflexure_microscope_server/things/autofocus.py b/src/openflexure_microscope_server/things/autofocus.py
index 89bbc8a8..58ca704e 100644
--- a/src/openflexure_microscope_server/things/autofocus.py
+++ b/src/openflexure_microscope_server/things/autofocus.py
@@ -291,7 +291,7 @@ class AutofocusThing(Thing):
         capture: CaptureDep,
         images_dir: str,
         stack_dir: str,
-        target_resolution: tuple[int, int],
+        capture_resolution: tuple[int, int],
     ) -> None:
         """Run a z stack, saving all images to stack_dir and copying the
         central image to stack_dir"""
@@ -322,8 +322,8 @@ class AutofocusThing(Thing):
             if capture_count + 1 < images_to_capture:
                 stage.move_relative(z=stack_dz)
             moved = time.time()
-            if image.size != target_resolution:
-                image = image.resize(target_resolution, Image.BOX)
+            if image.size != capture_resolution:
+                image = image.resize(capture_resolution, Image.BOX)
             downsampled = time.time()
             capture._save_capture(
                 jpeg_path=jpeg_path,
diff --git a/src/openflexure_microscope_server/things/smart_scan.py b/src/openflexure_microscope_server/things/smart_scan.py
index efdb5b73..6f2b69cd 100644
--- a/src/openflexure_microscope_server/things/smart_scan.py
+++ b/src/openflexure_microscope_server/things/smart_scan.py
@@ -92,7 +92,6 @@ SCAN_DATA_FILENAME = "scan_data.json"
 STITCHING_CMD = "openflexure-stitch"
 
 SCAN_ZERO_PAD_DIGITS = 4
-TARGET_RESOLUTION = (1640, 1232)
 STITCHING_RESOLUTION = (820, 616)
 
 
@@ -421,7 +420,7 @@ class SmartScanThing(Thing):
         """
         overlap = self.overlap
         dx, dy = self._calc_displacement_from_test_image(overlap)
-        stitch_resize = STITCHING_RESOLUTION[0] / TARGET_RESOLUTION[0]
+        stitch_resize = STITCHING_RESOLUTION[0] / self.capture_resolution[0]
 
         self._scan_logger.debug(f"Resizing images when stitching by {stitch_resize}")
 
@@ -452,6 +451,7 @@ class SmartScanThing(Thing):
             "skip_background": self.skip_background,
             "stitch_automatically": self.stitch_automatically,
             "stitch_resize": stitch_resize,
+            "capture_resolution": self.capture_resolution,
         }
 
     @_scan_running
@@ -470,6 +470,7 @@ class SmartScanThing(Thing):
             "dy": self._scan_data["dy"],
             "start time": self._scan_data["start_time"],
             "skipping background": self._scan_data["skip_background"],
+            "capture resolution": self._scan_data["capture_resolution"],
         }
 
         scan_inputs_fname = os.path.join(
@@ -675,7 +676,7 @@ class SmartScanThing(Thing):
             self._autofocus.run_z_stack(
                 images_dir=self._ongoing_scan_images_dir,
                 stack_dir=site_folder,
-                target_resolution=TARGET_RESOLUTION,
+                capture_resolution=self._scan_data["capture_resolution"],
             )
 
             # increment capure counter as thread has completed
@@ -744,6 +745,16 @@ class SmartScanThing(Thing):
             raise HTTPException(404, "File not found")
         return FileResponse(path)
 
+    @thing_property
+    def capture_resolution(self) -> tuple[int, int]:
+        """A tuple of the image resolution to capture. Should be in a
+        4:3 aspect ratio"""
+        return self.thing_settings.get("capture_resolution", ((1640, 1232)))
+
+    @capture_resolution.setter
+    def capture_resolution(self, value: tuple[int, int]) -> None:
+        self.thing_settings["capture_resolution"] = value
+
     @thing_property
     def max_range(self) -> int:
         """The maximum distance from the centre of the scan before we break in steps"""