diff --git a/meshroom/nodes/aliceVision/LdrToHdrCalibration.py b/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
index 5dbd7530..3d10baac 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
@@ -238,7 +238,7 @@ Calibrate LDR to HDR response curve from samples.
             fnumber, shutterSpeed, iso = exp
             if exposures:
                 prevFnumber, prevShutterSpeed, prevIso = exposures[-1]
-            if exposures and len(exposures) > 1 and (fnumber != prevFnumber or shutterSpeed > prevShutterSpeed or iso != prevIso) or newGroup:
+            if exposures and len(exposures) > 1 and (fnumber > prevFnumber or shutterSpeed > prevShutterSpeed or iso < prevIso) or newGroup:
                 exposureGroups.append(exposures)
                 exposures = [exp]
             else:
@@ -273,5 +273,4 @@ Calibrate LDR to HDR response curve from samples.
                         bestTuple = tuple if tuple[0] > bestTuple[0] else bestTuple
 
                 bestBracketSize = bestTuple[0]
-                bestCount = bestTuple[1]
                 node.nbBrackets.value = bestBracketSize
diff --git a/meshroom/nodes/aliceVision/LdrToHdrMerge.py b/meshroom/nodes/aliceVision/LdrToHdrMerge.py
index 62dbc434..1a4ad837 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrMerge.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrMerge.py
@@ -324,7 +324,7 @@ Merge LDR images into HDR images.
             fnumber, shutterSpeed, iso = exp
             if exposures:
                 prevFnumber, prevShutterSpeed, prevIso = exposures[-1]
-            if exposures and len(exposures) > 1 and (fnumber != prevFnumber or shutterSpeed > prevShutterSpeed or iso != prevIso) or newGroup:
+            if exposures and len(exposures) > 1 and (fnumber > prevFnumber or shutterSpeed > prevShutterSpeed or iso < prevIso) or newGroup:
                 exposureGroups.append(exposures)
                 exposures = [exp]
             else:
@@ -359,7 +359,6 @@ Merge LDR images into HDR images.
                         bestTuple = tuple if tuple[0] > bestTuple[0] else bestTuple
 
                 bestBracketSize = bestTuple[0]
-                bestCount = bestTuple[1]
                 node.nbBrackets.value = bestBracketSize
 
     def processChunk(self, chunk):
diff --git a/meshroom/nodes/aliceVision/LdrToHdrSampling.py b/meshroom/nodes/aliceVision/LdrToHdrSampling.py
index 61e09714..36c0c78d 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrSampling.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrSampling.py
@@ -264,7 +264,7 @@ Sample pixels from Low range images for HDR creation.
             fnumber, shutterSpeed, iso = exp
             if exposures:
                 prevFnumber, prevShutterSpeed, prevIso = exposures[-1]
-            if exposures and len(exposures) > 1 and (fnumber != prevFnumber or shutterSpeed > prevShutterSpeed or iso != prevIso) or newGroup:
+            if exposures and len(exposures) > 1 and (fnumber > prevFnumber or shutterSpeed > prevShutterSpeed or iso < prevIso) or newGroup:
                 exposureGroups.append(exposures)
                 exposures = [exp]
             else: