diff --git a/MASH-FRET/.release_version.json b/MASH-FRET/.release_version.json
index 4b8e9931..e00aafbe 100644
--- a/MASH-FRET/.release_version.json
+++ b/MASH-FRET/.release_version.json
@@ -1,4 +1,4 @@
 {
 "tag" : "1.3.3.3",
-"prev_commit_hash" : "fd17e646"
+"prev_commit_hash" : "ea483ee5"
 }
diff --git a/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/buildMappingTool.m b/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/buildMappingTool.m
index dd8b4411..0249d46d 100644
--- a/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/buildMappingTool.m
+++ b/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/buildMappingTool.m
@@ -18,9 +18,7 @@ function buildMappingTool(img, lim, h_fig)
 htxt = 14;
 winratio = 0.75;
 zoomsldratio = 0.3;
-stpbig = 1/4;
-stpzoomsmall = 1/20;
-zoomfactmax = 5;
+zoomfactmax = 10;
 figttl = 'Mapping tool';
 menulbl0 = 'Delete last point';
 menulbl1 = 'Delete last set';
@@ -145,7 +143,7 @@ function buildMappingTool(img, lim, h_fig)
 y = y+htxt;
 q.slider_zoom = uicontrol('Style', 'slider', 'Units', un, 'Position', ...
     [x y wtxt hsld], 'Min', 1, 'Max', zoomfactmax, 'Value', 1, ...
-    'SliderStep', [stpzoomsmall stpbig], 'Callback', ...
+    'SliderStep', [1/(4*(zoomfactmax-1)) 1/(zoomfactmax-1)], 'Callback', ...
     {@slider_zoom_Callback, h_fig});
 
 
diff --git a/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/updatePnts.m b/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/updatePnts.m
index 3f3f6e43..a0f3bcb6 100644
--- a/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/updatePnts.m
+++ b/MASH-FRET/source/mod-video-processing/coordinates/mapping_tool/updatePnts.m
@@ -55,9 +55,11 @@ function updatePnts(h_fig)
 for c = 1:nChan
     q.txt{c} = [];
     q.txtFull{c} = [];
+    x_lim = get(q.axes_top(c), 'XLim');
     y_lim = get(q.axes_top(c), 'YLim');
     for n = 1:size(pntCoord{c},1)
-        if pntCoord{c}(n,2)>y_lim(1) && pntCoord{c}(n,2)<y_lim(2)
+        if pntCoord{c}(n,2)>y_lim(1) && pntCoord{c}(n,2)<y_lim(2) && ...
+                pntCoord{c}(n,1)>x_lim(1) && pntCoord{c}(n,1)<x_lim(2)
             q.txt{c}(size(q.txt{c},1)+1,1) = text('Parent', ...
                 q.axes_top(c), 'String', num2str(pntCoord{c}(n,3)), ...
                 'FontUnits', 'points', 'FontSize', 7, 'FontWeight', ...