diff --git a/src/emucore/FrameBuffer.cxx b/src/emucore/FrameBuffer.cxx
index f5601dd07..1d390aea2 100644
--- a/src/emucore/FrameBuffer.cxx
+++ b/src/emucore/FrameBuffer.cxx
@@ -875,7 +875,7 @@ void FrameBuffer::setAvailableVidModes(uInt32 baseWidth, uInt32 baseHeight)
   if(tiaMode)
   {
     // TIA windowed modes
-    uInt32 minZoom = 2 * hidpiScaleFactor();
+    uInt32 minZoom = supportedTIAMinZoom();
     myTIAMaxZoom = maxZoomForScreen(baseWidth, baseHeight,
                      myAbsDesktopSize.w, myAbsDesktopSize.h);
 
diff --git a/src/gui/VideoDialog.cxx b/src/gui/VideoDialog.cxx
index 637f6fc8e..935bfd524 100644
--- a/src/gui/VideoDialog.cxx
+++ b/src/gui/VideoDialog.cxx
@@ -337,9 +337,12 @@ void VideoDialog::loadConfig()
   // TIA zoom levels
   // These are dynamically loaded, since they depend on the size of
   // the desktop and which renderer we're using
-  myTIAZoom->setMinValue(instance().frameBuffer().supportedTIAMinZoom() * 100);
-  myTIAZoom->setMaxValue(instance().frameBuffer().supportedTIAMaxZoom() * 100);
-  myTIAZoom->setTickmarkIntervals((instance().frameBuffer().supportedTIAMaxZoom() - 2) * 2);
+  float minZoom = instance().frameBuffer().supportedTIAMinZoom(); // or 2 if we allow lower values
+  float maxZoom = instance().frameBuffer().supportedTIAMaxZoom();
+
+  myTIAZoom->setMinValue(minZoom * 100);
+  myTIAZoom->setMaxValue(maxZoom * 100);
+  myTIAZoom->setTickmarkIntervals((maxZoom - minZoom) * 2); // every ~50%
   myTIAZoom->setValue(instance().settings().getFloat("tia.zoom") * 100);
 
   // TIA Palette