diff --git a/toonz/sources/include/toonzqt/camerasettingswidget.h b/toonz/sources/include/toonzqt/camerasettingswidget.h
index c8dbac77..01b42874 100644
--- a/toonz/sources/include/toonzqt/camerasettingswidget.h
+++ b/toonz/sources/include/toonzqt/camerasettingswidget.h
@@ -40,7 +40,7 @@ class DoubleLineEdit;
 class IntLineEdit;
 class MeasuredDoubleLineEdit;
 class CheckBox;
-}
+}  // namespace DVGui
 
 //---------------------------------------------------------------
 
@@ -124,8 +124,8 @@ public:
   // camera => widget fields (i.e. initialize widget)
   void setFields(const TCamera *camera);
 
-  // widget fields => camera
-  void getFields(TCamera *camera);
+  // widget fields => camera return true if the value is actually changed
+  bool getFields(TCamera *camera);
 
   QSize sizeHint() const override { return minimumSize(); }
 
diff --git a/toonz/sources/toonz/camerasettingspopup.cpp b/toonz/sources/toonz/camerasettingspopup.cpp
index d2f7957a..26fb58dc 100644
--- a/toonz/sources/toonz/camerasettingspopup.cpp
+++ b/toonz/sources/toonz/camerasettingspopup.cpp
@@ -224,11 +224,12 @@ void CameraSettingsPopup::updateWindowTitle() {
 void CameraSettingsPopup::onChanged() {
   TCamera *camera = getCamera();
   if (!camera) return;
-  m_cameraSettingsWidget->getFields(camera);
-  TApp::instance()->getCurrentScene()->notifySceneChanged();
-  TApp::instance()->getCurrentXsheet()->notifyXsheetChanged();
+  if (m_cameraSettingsWidget->getFields(camera)) {
+    TApp::instance()->getCurrentScene()->notifySceneChanged();
+    TApp::instance()->getCurrentXsheet()->notifyXsheetChanged();
 
-  emit changed();
+    emit changed();
+  }
 }
 
 void CameraSettingsPopup::onNameChanged() {
diff --git a/toonz/sources/toonzqt/camerasettingswidget.cpp b/toonz/sources/toonzqt/camerasettingswidget.cpp
index dd1e4962..3d57afa0 100644
--- a/toonz/sources/toonzqt/camerasettingswidget.cpp
+++ b/toonz/sources/toonzqt/camerasettingswidget.cpp
@@ -591,9 +591,14 @@ void CameraSettingsWidget::setFields(const TCamera *camera) {
   updatePresetListOm();
 }
 
-void CameraSettingsWidget::getFields(TCamera *camera) {
+bool CameraSettingsWidget::getFields(TCamera *camera) {
+  TDimensionD old_sz = camera->getSize();
+  TDimension old_res = camera->getRes();
+
+  if (old_sz == getSize() && old_res == getRes()) return false;
   camera->setSize(getSize());
   camera->setRes(getRes());
+  return true;
 }
 
 TDimensionD CameraSettingsWidget::getSize() const {
@@ -954,8 +959,8 @@ double CameraSettingsWidget::aspectRatioStringToValue(const QString &s) {
   }
   int i = s.indexOf("/");
   if (i <= 0 || i + 1 >= s.length()) return s.toDouble();
-  int num           = s.left(i).toInt();
-  int den           = s.mid(i + 1).toInt();
+  int num = s.left(i).toInt();
+  int den = s.mid(i + 1).toInt();
   if (den <= 0) den = 1;
   return (double)num / (double)den;
 }