diff --git a/rtengine/camconst.json b/rtengine/camconst.json
index de06f670f..01b73d0e7 100644
--- a/rtengine/camconst.json
+++ b/rtengine/camconst.json
@@ -1401,9 +1401,17 @@ Camera constants:
         "ranges": { "white": [ 16105, 16270, 16082 ] } // These values are the lowest pixel values >16000 for all ISOs. LENR has a negligble effect.
         // No aperture scaling data provided, but likely negligible
     },
-
-    { // Quality C, only raw crop
-        "make_model": [ "FUJIFILM X-T3", "FUJIFILM X-T30", "FUJIFILM X-PRO3", "FUJIFILM X100V", "FUJIFILM X-T4" ],
+    
+    { // Quality A, samples provided by Daniel Catalina (#5839) and pi99y (#5860)
+        "make_model": [ "FUJIFILM X-T3", "FUJIFILM X-PRO3" ],
+        "dcraw_matrix": [ 13426,-6334,-1177,-4244,12136,2371,-580,1303,5980 ], // DNG_v11, standard_v2 d65
+        "raw_crop": [ 0, 5, 6252, 4176],
+        "white": [ 16170, 16275, 16170 ] // typical safe-margins with LENR
+        // negligible aperture scaling effect
+    },
+    
+    { // Quality B
+        "make_model": [ "FUJIFILM X-T30", "FUJIFILM X100V", "FUJIFILM X-T4" ],
         "dcraw_matrix": [ 13426,-6334,-1177,-4244,12136,2371,-580,1303,5980 ], // DNG_v11, standard_v2 d65
         "raw_crop": [ 0, 5, 6252, 4176]
     },