diff --git a/rtengine/camconst.json b/rtengine/camconst.json
index 3463bfcc9..f2db455a3 100644
--- a/rtengine/camconst.json
+++ b/rtengine/camconst.json
@@ -1,4 +1,5 @@
 /*
+vim: set syntax=javascript:
 
 DO NOT EDIT THIS FILE!
 
@@ -2142,10 +2143,17 @@ Camera constants:
         }
     },
 
-    { // Quality B, issue #5204. Missing ISO 50, 64 and 80 and I expect the WL to differ for these ISO values
+    { // Quality A, issue #5204.
         "make_model": [ "Panasonic DC-S1" ],
         "dcraw_matrix": [ 9744, -3905, -779, -4899, 12807, 2324, -798, 1630, 5827 ], // ColorMatrix2 using illuminant D65 from Adobe DNG Converter 11.4
-        "ranges": { "white": 16320 }
+        "ranges": {
+            "white": [
+                { "iso": 50, "levels": 8400 }, // LENR 8000
+                { "iso": 64, "levels": 10450 }, // LENR 10000
+                { "iso": 80, "levels": 13050 }, // LENR 12400
+                { "iso": 100, "levels": 16320 }
+            ]
+        }
     },
 
     { // Quality X, issue #5204. No white frames available.