diff --git a/StreamViewer.cs b/StreamViewer.cs
index fcda9b4..b965f58 100644
--- a/StreamViewer.cs
+++ b/StreamViewer.cs
@@ -10,8 +10,8 @@ namespace robospot_camera_finder
 
         MainForm.Camera camera;
 
-        int max_zoom_pulse = 9999;
-        int min_zoom_pulse = 10;
+        const int MAX_ZOOM_PULSE = 9999;
+        const int MIN_ZOOM_PULSE = 10;
 
         bool zoomTestSeqFlag = false;
 
@@ -23,6 +23,7 @@ namespace robospot_camera_finder
             _mp = new MediaPlayer(_libVLC);
 
             camera = cam;
+
             this.Text = camera.camera_name;
 
             if (!cam.camera_ip.StartsWith("10."))
@@ -59,13 +60,13 @@ namespace robospot_camera_finder
         private void sendZoomValue(string zoom_pulse)
         {
             // clamp values to allowed range
-            if (int.Parse(zoom_pulse) < min_zoom_pulse)
+            if (int.Parse(zoom_pulse) < MIN_ZOOM_PULSE)
             {
-                zoom_pulse = min_zoom_pulse.ToString();
+                zoom_pulse = MIN_ZOOM_PULSE.ToString();
             }
-            if (int.Parse(zoom_pulse) > max_zoom_pulse)
+            if (int.Parse(zoom_pulse) > MAX_ZOOM_PULSE)
             {
-                zoom_pulse = max_zoom_pulse.ToString();
+                zoom_pulse = MAX_ZOOM_PULSE.ToString();
             }
 
             HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://" + camera.camera_ip + "/stw-cgi/ptzcontrol.cgi?msubmenu=absolute&action=control&ZoomPulse=" + zoom_pulse);
@@ -105,13 +106,13 @@ namespace robospot_camera_finder
 
         private void btnZoomMax_Click(object sender, EventArgs e)
         {
-            tbZoom.Value = max_zoom_pulse;
+            tbZoom.Value = MAX_ZOOM_PULSE;
             sendZoomValue(tbZoom.Value.ToString());
         }
 
         private void btnZoomMin_Click(object sender, EventArgs e)
         {
-            tbZoom.Value = min_zoom_pulse;
+            tbZoom.Value = MIN_ZOOM_PULSE;
             sendZoomValue(tbZoom.Value.ToString());
         }
 
@@ -130,12 +131,12 @@ namespace robospot_camera_finder
         {
             if (zoomTestSeqFlag)
             {
-                tbZoom.Value = min_zoom_pulse;
+                tbZoom.Value = MIN_ZOOM_PULSE;
                 sendZoomValue(tbZoom.Value.ToString());
                 zoomTestSeqFlag = false;
             } else
             {
-                tbZoom.Value = max_zoom_pulse;
+                tbZoom.Value = MAX_ZOOM_PULSE;
                 sendZoomValue(tbZoom.Value.ToString());
                 zoomTestSeqFlag = true;
             }