diff --git a/lib/screens/metering/communication/bloc_communication_metering.dart b/lib/screens/metering/communication/bloc_communication_metering.dart
index f80866c..40dcd73 100644
--- a/lib/screens/metering/communication/bloc_communication_metering.dart
+++ b/lib/screens/metering/communication/bloc_communication_metering.dart
@@ -8,6 +8,7 @@ class MeteringCommunicationBloc extends Bloc<MeteringCommunicationEvent, Meterin
     // `MeasureState` is not const, so that `Bloc` treats each state as new and updates state stream
     // ignore: prefer_const_constructors
     on<MeasureEvent>((_, emit) => emit(MeasureState()));
+    on<EquipmentProfileChangedEvent>((event, emit) => emit(EquipmentProfileChangedState(event.profile)));
     on<MeteringInProgressEvent>((event, emit) => emit(MeteringInProgressState(event.ev100)));
     on<MeteringEndedEvent>((event, emit) => emit(MeteringEndedState(event.ev100)));
     on<ScreenOnTopOpenedEvent>((_, emit) => emit(const SettingsOpenedState()));
diff --git a/lib/screens/metering/communication/event_communication_metering.dart b/lib/screens/metering/communication/event_communication_metering.dart
index 8872fa0..8c12656 100644
--- a/lib/screens/metering/communication/event_communication_metering.dart
+++ b/lib/screens/metering/communication/event_communication_metering.dart
@@ -1,19 +1,29 @@
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
 abstract class MeteringCommunicationEvent {
   const MeteringCommunicationEvent();
 }
 
-abstract class SourceEvent extends MeteringCommunicationEvent {
-  const SourceEvent();
-}
-
+/// Events sent by the screen to the current metering source.
 abstract class ScreenEvent extends MeteringCommunicationEvent {
   const ScreenEvent();
 }
 
+/// Event sent by the current metering source in response for the screen events.
+abstract class SourceEvent extends MeteringCommunicationEvent {
+  const SourceEvent();
+}
+
 class MeasureEvent extends ScreenEvent {
   const MeasureEvent();
 }
 
+class EquipmentProfileChangedEvent extends ScreenEvent {
+  final EquipmentProfile profile;
+
+  const EquipmentProfileChangedEvent(this.profile);
+}
+
 abstract class MeasuredEvent extends SourceEvent {
   final double? ev100;
 
diff --git a/lib/screens/metering/communication/state_communication_metering.dart b/lib/screens/metering/communication/state_communication_metering.dart
index 2d3991e..1090bdc 100644
--- a/lib/screens/metering/communication/state_communication_metering.dart
+++ b/lib/screens/metering/communication/state_communication_metering.dart
@@ -1,3 +1,5 @@
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
 sealed class MeteringCommunicationState {
   const MeteringCommunicationState();
 }
@@ -18,6 +20,12 @@ class MeasureState extends SourceState {
   const MeasureState();
 }
 
+class EquipmentProfileChangedState extends SourceState {
+  final EquipmentProfile profile;
+
+  const EquipmentProfileChangedState(this.profile);
+}
+
 sealed class MeasuredState extends ScreenState {
   final double? ev100;
 
diff --git a/lib/screens/metering/components/camera_container/bloc_container_camera.dart b/lib/screens/metering/components/camera_container/bloc_container_camera.dart
index ef6125e..99d78a8 100644
--- a/lib/screens/metering/components/camera_container/bloc_container_camera.dart
+++ b/lib/screens/metering/components/camera_container/bloc_container_camera.dart
@@ -26,11 +26,12 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
   final LightmeterAnalytics _analytics;
   late final _WidgetsBindingObserver _observer;
 
+  CameraDescription? _camera;
   CameraController? _cameraController;
 
   static const _maxZoom = 7.0;
   RangeValues? _zoomRange;
-  double _currentZoom = 0.0;
+  double _currentZoom = 1.0;
 
   static const _exposureMaxRange = RangeValues(-4, 4);
   RangeValues? _exposureOffsetRange;
@@ -85,6 +86,12 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
             }
           });
         }
+      case final communication_states.EquipmentProfileChangedState communicationState:
+        if (state is CameraActiveState) {
+          add(ZoomChangedEvent(communicationState.profile.lensZoom));
+        } else {
+          _currentZoom = communicationState.profile.lensZoom;
+        }
       case communication_states.SettingsOpenedState():
         _settingsOpened = true;
         add(const DeinitializeEvent());
@@ -116,46 +123,66 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
     }
 
     try {
-      final cameras = await availableCameras();
-      if (cameras.isEmpty) {
-        emit(const CameraErrorState(CameraErrorType.noCamerasDetected));
-        return;
+      if (_camera == null) {
+        final cameras = await availableCameras();
+        if (cameras.isEmpty) {
+          emit(const CameraErrorState(CameraErrorType.noCamerasDetected));
+          return;
+        } else {
+          _camera = cameras.firstWhere(
+            (camera) => camera.lensDirection == CameraLensDirection.back,
+            orElse: () => cameras.last,
+          );
+        }
       }
-      _cameraController = CameraController(
-        cameras.firstWhere(
-          (camera) => camera.lensDirection == CameraLensDirection.back,
-          orElse: () => cameras.last,
-        ),
+
+      final cameraController = CameraController(
+        _camera!,
         ResolutionPreset.low,
         enableAudio: false,
       );
+      await cameraController.initialize();
+      await cameraController.setFlashMode(FlashMode.off);
+      await cameraController.lockCaptureOrientation(DeviceOrientation.portraitUp);
 
-      await _cameraController!.initialize();
-      await _cameraController!.setFlashMode(FlashMode.off);
-      await _cameraController!.lockCaptureOrientation(DeviceOrientation.portraitUp);
+      if (_exposureOffsetRange == null) {
+        await Future.wait<double>([
+          cameraController.getMinExposureOffset(),
+          cameraController.getMaxExposureOffset(),
+          cameraController.getExposureOffsetStepSize(),
+        ]).then((value) {
+          _exposureOffsetRange = RangeValues(
+            math.max(_exposureMaxRange.start, value[0]),
+            math.min(_exposureMaxRange.end, value[1]),
+          );
+          _currentExposureOffset = 0.0;
+          _exposureStep = value[2] == 0 ? 0.1 : value[2];
+        });
+      }
 
-      _zoomRange = await Future.wait<double>([
-        _cameraController!.getMinZoomLevel(),
-        _cameraController!.getMaxZoomLevel(),
-      ]).then((levels) => RangeValues(math.max(1.0, levels[0]), math.min(_maxZoom, levels[1])));
-      _currentZoom = _zoomRange!.start;
+      if (_zoomRange == null) {
+        await Future.wait<double>([
+          cameraController.getMinZoomLevel(),
+          cameraController.getMaxZoomLevel(),
+        ]).then((value) {
+          _zoomRange = RangeValues(
+            math.max(1.0, value[0]),
+            math.min(_maxZoom, value[1]),
+          );
+          if (_currentZoom < _zoomRange!.start || _currentZoom > _zoomRange!.end) {
+            _currentZoom = _zoomRange!.start;
+          }
+        });
+      }
 
-      _exposureOffsetRange = await Future.wait<double>([
-        _cameraController!.getMinExposureOffset(),
-        _cameraController!.getMaxExposureOffset(),
-      ]).then(
-        (levels) => RangeValues(
-          math.max(_exposureMaxRange.start, levels[0]),
-          math.min(_exposureMaxRange.end, levels[1]),
-        ),
-      );
-      await _cameraController!.getExposureOffsetStepSize().then((value) {
-        _exposureStep = value == 0 ? 0.1 : value;
-      });
-      _currentExposureOffset = 0.0;
-
-      emit(CameraInitializedState(_cameraController!));
+      /// For app startup initialization this effectively isn't executed.
+      await Future.wait<void>([
+        if (_currentZoom != 1.0) cameraController.setZoomLevel(_currentZoom),
+        if (_currentExposureOffset != 0.0) cameraController.setExposureOffset(_currentExposureOffset),
+      ]);
 
+      _cameraController = cameraController;
+      emit(CameraInitializedState(cameraController));
       _emitActiveState(emit);
     } catch (e) {
       emit(const CameraErrorState(CameraErrorType.other));
@@ -169,7 +196,7 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
   }
 
   Future<void> _onZoomChanged(ZoomChangedEvent event, Emitter emit) async {
-    if (_cameraController != null) {
+    if (_cameraController != null && _zoomRange != null) {
       final double zoom = event.value.clamp(_zoomRange!.start, _zoomRange!.end);
       _cameraController!.setZoomLevel(zoom);
       _currentZoom = zoom;
diff --git a/lib/screens/metering/components/camera_container/components/camera_controls/components/zoom_slider/widget_slider_zoom.dart b/lib/screens/metering/components/camera_container/components/camera_controls/components/zoom_slider/widget_slider_zoom.dart
index 316d547..48ec91f 100644
--- a/lib/screens/metering/components/camera_container/components/camera_controls/components/zoom_slider/widget_slider_zoom.dart
+++ b/lib/screens/metering/components/camera_container/components/camera_controls/components/zoom_slider/widget_slider_zoom.dart
@@ -3,7 +3,7 @@ import 'package:lightmeter/providers/equipment_profile_provider.dart';
 import 'package:lightmeter/screens/shared/ruler_slider/widget_slider_ruler.dart';
 import 'package:lightmeter/utils/double_to_zoom.dart';
 
-class ZoomSlider extends StatefulWidget {
+class ZoomSlider extends StatelessWidget {
   final RangeValues range;
   final double value;
   final ValueChanged<double> onChanged;
@@ -15,23 +15,12 @@ class ZoomSlider extends StatefulWidget {
     super.key,
   });
 
-  @override
-  State<ZoomSlider> createState() => _ZoomSliderState();
-}
-
-class _ZoomSliderState extends State<ZoomSlider> {
-  @override
-  void didChangeDependencies() {
-    super.didChangeDependencies();
-    widget.onChanged(EquipmentProfiles.selectedOf(context).lensZoom);
-  }
-
   @override
   Widget build(BuildContext context) {
     return RulerSlider(
-      range: widget.range,
-      value: widget.value,
-      onChanged: widget.onChanged,
+      range: range,
+      value: value,
+      onChanged: onChanged,
       icon: Icons.search_outlined,
       defaultValue: EquipmentProfiles.selectedOf(context).lensZoom,
       rulerValueAdapter: (value) => value.toStringAsFixed(0),
diff --git a/lib/screens/metering/components/shared/readings_container/components/equipment_profile_picker/widget_picker_equipment_profiles.dart b/lib/screens/metering/components/shared/readings_container/components/equipment_profile_picker/widget_picker_equipment_profiles.dart
index 4930c46..45560e8 100644
--- a/lib/screens/metering/components/shared/readings_container/components/equipment_profile_picker/widget_picker_equipment_profiles.dart
+++ b/lib/screens/metering/components/shared/readings_container/components/equipment_profile_picker/widget_picker_equipment_profiles.dart
@@ -1,13 +1,28 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/providers/equipment_profile_provider.dart';
+import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
+import 'package:lightmeter/screens/metering/communication/event_communication_metering.dart';
 import 'package:lightmeter/screens/metering/components/shared/readings_container/components/shared/animated_dialog_picker/widget_picker_dialog_animated.dart';
 import 'package:lightmeter/screens/metering/components/shared/readings_container/components/shared/reading_value_container/widget_container_reading_value.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
-class EquipmentProfilePicker extends StatelessWidget {
+class EquipmentProfilePicker extends StatefulWidget {
   const EquipmentProfilePicker();
 
+  @override
+  State<EquipmentProfilePicker> createState() => _EquipmentProfilePickerState();
+}
+
+class _EquipmentProfilePickerState extends State<EquipmentProfilePicker> {
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    final profile = EquipmentProfiles.selectedOf(context);
+    context.read<MeteringCommunicationBloc>().add(EquipmentProfileChangedEvent(profile));
+  }
+
   @override
   Widget build(BuildContext context) {
     return AnimatedDialogPicker<EquipmentProfile>(
@@ -16,7 +31,10 @@ class EquipmentProfilePicker extends StatelessWidget {
       selectedValue: EquipmentProfiles.selectedOf(context),
       values: EquipmentProfiles.inUseOf(context),
       itemTitleBuilder: (_, value) => Text(value.id.isEmpty ? S.of(context).none : value.name),
-      onChanged: EquipmentProfilesProvider.of(context).selectProfile,
+      onChanged: (profile) {
+        EquipmentProfilesProvider.of(context).selectProfile(profile);
+        context.read<MeteringCommunicationBloc>().add(EquipmentProfileChangedEvent(profile));
+      },
       closedChild: ReadingValueContainer.singleValue(
         value: ReadingValue(
           label: S.of(context).equipmentProfile,
diff --git a/test/screens/metering/components/shared/readings_container/equipment_profile_picker_test.dart b/test/screens/metering/components/shared/readings_container/equipment_profile_picker_test.dart
index bf97fea..4fb63d9 100644
--- a/test/screens/metering/components/shared/readings_container/equipment_profile_picker_test.dart
+++ b/test/screens/metering/components/shared/readings_container/equipment_profile_picker_test.dart
@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/providers/equipment_profile_provider.dart';
+import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
 import 'package:lightmeter/screens/metering/components/shared/readings_container/components/equipment_profile_picker/widget_picker_equipment_profiles.dart';
 import 'package:m3_lightmeter_iap/m3_lightmeter_iap.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
@@ -33,8 +35,11 @@ void main() {
         ],
         child: EquipmentProfilesProvider(
           storageService: storageService,
-          child: const WidgetTestApplicationMock(
-            child: Row(children: [Expanded(child: EquipmentProfilePicker())]),
+          child: WidgetTestApplicationMock(
+            child: BlocProvider(
+              create: (_) => MeteringCommunicationBloc(),
+              child: const Row(children: [Expanded(child: EquipmentProfilePicker())]),
+            ),
           ),
         ),
       ),