diff --git a/src/artemis/device_setup_plans/setup_oav.py b/src/artemis/device_setup_plans/setup_oav.py
index fc25aa085..c4ff40bfe 100644
--- a/src/artemis/device_setup_plans/setup_oav.py
+++ b/src/artemis/device_setup_plans/setup_oav.py
@@ -82,9 +82,6 @@ def pre_centring_setup_oav(oav: OAV, parameters: OAVParameters):
         parameters.detection_script_filename,
     )
 
-    # Connect MXSC output to MJPG input for debugging
-    yield from bps.abs_set(oav.snapshot.input_plugin, "OAV.MXSC")
-
     zoom_level_str = f"{float(parameters.zoom)}x"
     if zoom_level_str not in oav.zoom_controller.allowed_zoom_levels:
         raise OAVError_ZoomLevelNotFound(
@@ -92,10 +89,14 @@ def pre_centring_setup_oav(oav: OAV, parameters: OAVParameters):
         )
 
     yield from bps.abs_set(
-        oav.zoom_controller.level,
+        oav.zoom_controller,
         zoom_level_str,
         wait=True,
     )
+
+    # Connect MXSC output to MJPG input for debugging
+    yield from bps.abs_set(oav.snapshot.input_plugin, "OAV.MXSC")
+
     yield from bps.wait()
 
     """
diff --git a/src/artemis/device_setup_plans/unit_tests/test_setup_oav.py b/src/artemis/device_setup_plans/unit_tests/test_setup_oav.py
new file mode 100644
index 000000000..dbd41bab4
--- /dev/null
+++ b/src/artemis/device_setup_plans/unit_tests/test_setup_oav.py
@@ -0,0 +1,51 @@
+import pytest
+from bluesky.run_engine import RunEngine
+from dodal.beamlines import i03
+from dodal.devices.oav.oav_parameters import OAVParameters
+
+from artemis.device_setup_plans.setup_oav import pre_centring_setup_oav
+
+ZOOM_LEVELS_XML = (
+    "src/artemis/experiment_plans/tests/test_data/jCameraManZoomLevels.xml"
+)
+OAV_CENTRING_JSON = "src/artemis/experiment_plans/tests/test_data/OAVCentring.json"
+DISPLAY_CONFIGURATION = (
+    "src/artemis/experiment_plans/tests/test_data/display.configuration"
+)
+
+
+@pytest.fixture
+def mock_parameters():
+    return OAVParameters(
+        "loopCentring", ZOOM_LEVELS_XML, OAV_CENTRING_JSON, DISPLAY_CONFIGURATION
+    )
+
+
+@pytest.mark.parametrize(
+    "zoom, expected_plugin",
+    [
+        ("1.0", "proc"),
+        ("7.0", "CAM"),
+    ],
+)
+def test_when_set_up_oav_with_different_zoom_levels_then_flat_field_applied_correctly(
+    zoom, expected_plugin, mock_parameters: OAVParameters
+):
+    oav = i03.oav(fake_with_ophyd_sim=True)
+
+    oav.proc.port_name.sim_put("proc")
+    oav.cam.port_name.sim_put("CAM")
+
+    oav.zoom_controller.zrst.set("1.0x")
+    oav.zoom_controller.onst.set("2.0x")
+    oav.zoom_controller.twst.set("3.0x")
+    oav.zoom_controller.thst.set("5.0x")
+    oav.zoom_controller.frst.set("7.0x")
+    oav.zoom_controller.fvst.set("9.0x")
+
+    mock_parameters.zoom = zoom
+
+    RE = RunEngine()
+    RE(pre_centring_setup_oav(oav, mock_parameters))
+    assert oav.mxsc.input_plugin.get() == expected_plugin
+    assert oav.snapshot.input_plugin.get() == "OAV.MXSC"