diff --git a/pt2d/gui/advancedSettingsWidget.py b/pt2d/gui/advancedSettingsWidget.py
index 4adc855a519a640286051a5b95a3a32678ad8045..962e6c2ad44626973f44a15351d4733a7eda505e 100644
--- a/pt2d/gui/advancedSettingsWidget.py
+++ b/pt2d/gui/advancedSettingsWidget.py
@@ -52,7 +52,7 @@ class AdvancedSettingsWidget(QWidget):
         self._lab_contrast = QLabel("Contrast (0.01)")
         controls_layout.addWidget(self._lab_contrast, 2, 0)
         self.contrast_slider = QSlider(Qt.Horizontal)
-        self.contrast_slider.setRange(1, 20)
+        self.contrast_slider.setRange(1, 40)
         self.contrast_slider.setValue(1)  # i.e. 0.01
         self.contrast_slider.setSingleStep(1)
         self.contrast_slider.valueChanged.connect(self._on_contrast_slider)
@@ -138,7 +138,7 @@ class AdvancedSettingsWidget(QWidget):
         """
         Called when the contrast slider is moved.
         """
-        clip_limit = value / 100.0
+        clip_limit = value / 500.0
         self._lab_contrast.setText(f"Contrast ({clip_limit:.2f})")
         self._main_window.update_contrast(clip_limit)