diff --git a/rtdata/languages/default b/rtdata/languages/default
index a46f09a88..d4fb356e0 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2278,8 +2278,8 @@ TP_WAVELET_SETTINGS;Wavelet Settings
 TP_WAVELET_SHA;Sharp mask
 TP_WAVELET_SHFRAME;Shadows/Highlights
 TP_WAVELET_SHOWMASK;Show wavelet 'mask'
-TP_WAVELET_SIGMA;Sigma
-TP_WAVELET_SIGMA_TOOLTIP;Sigma acts on the relative amplitude of the signal width. The higher it is, the more the effect will be maximum and the more the unsightly effects will appear.\nLow values are recommended for creating tone-mapping in conjonction with usage Shadows/Highlights below
+TP_WAVELET_SIGMA;Effects
+TP_WAVELET_SIGMA_TOOLTIP;This slider controls how wide the range of contrast values are that receive the maximum effect from the tool.\n The higher it is, the more contrast values will be strongly modified and the higher the risk to generate artifacts. The lower it is, the more pinpoint will the effect be applied to a certain range of contrast values
 TP_WAVELET_SKIN;Skin targetting/protection
 TP_WAVELET_SKIN_TOOLTIP;At -100 skin-tones are targetted.\nAt 0 all tones are treated equally.\nAt +100 skin-tones are protected while all other tones are affected.
 TP_WAVELET_SKY;Sky targetting/protection
@@ -2313,7 +2313,7 @@ TP_WAVELET_USHARP;Clarity method
 TP_WAVELET_USHARP_TOOLTIP;Origin : the source file is the file before Wavelet.\nWavelet : the source file is the file including wavelet threatment
 TP_WAVELET_USH_TOOLTIP;If you select Sharp-mask, wavelet settings will be automatically positioned :\nBackground=black, Process=below, level=3...you can change level between 1 and 4.\n\nIf you select Clarity, wavelet settings will be automatically positioned :\nBackground=residual, Process=above, level=7..you can change level between 5 and 10 and wavelet levels.
 TP_WAVELET_WAVOFFSET;Offset
-TP_WAVELET_OFFSET_TOOLTIP;Offset modifies the balance between shadows and highlights.\n High values will amplify the contrast increase of the highlights, while low values will amplify the contrast increase of the shadows.
+TP_WAVELET_OFFSET_TOOLTIP;Offset modifies the balance between shadows and highlights.\n High values will amplify the contrast enhancement of the highlights, while low values will amplify the contrast enhancement of the shadows. Along with a low Max. effect value will help you selecting the contrasts that will be enhanced
 TP_WBALANCE_AUTO;Auto
 TP_WBALANCE_AUTOITCGREEN;Auto iterate temperature correlation
 TP_WBALANCE_AUTOOLD;Auto RGB grey
diff --git a/rtengine/ipwavelet.cc b/rtengine/ipwavelet.cc
index 99b915c65..125808336 100644
--- a/rtengine/ipwavelet.cc
+++ b/rtengine/ipwavelet.cc
@@ -1951,7 +1951,7 @@ void ImProcFunctions::WaveletcontAllL(LabImage * labco, float ** varhue, float *
                 float ** WavCoeffs_L = WaveletCoeffs_L.level_coeffs(lvl);
 
                 ContAllL(koeLi, maxkoeLi, true, maxlvl, labco,  varhue, varchrom, WavCoeffs_L, WavCoeffs_L0, lvl, dir, cp, Wlvl_L, Hlvl_L, skip, mean, sigma, MaxP, MaxN, wavCLVCcurve, waOpacityCurveW, ChCurve, Chutili);
-                //blur levels
+                //blur level
                 float klev = 1.f;
                 if(wavblcurve && wavcurvecomp && cp.blena && cp.bluwav > 0.f) {
 
@@ -1962,8 +1962,11 @@ void ImProcFunctions::WaveletcontAllL(LabImage * labco, float ** varhue, float *
                         bef[co] = WavCoeffs_L[dir][co];       
                     }
                     klev = (wavblcurve[lvl * 55.5f]);
-              
-                    klev *= cp.bluwav * lvl * 15.f / skip;
+                    float lvr = lvl;
+                    if(lvr == 0) {
+                        lvr = 1;
+                    }
+                    klev *= cp.bluwav * lvr * 10.f / skip;
                     boxblur(bef, aft, klev, Wlvl_L, Hlvl_L, false);
 
                     for (int co = 0; co < Hlvl_L * Wlvl_L; co++) {
@@ -2224,8 +2227,12 @@ void ImProcFunctions::WaveletcontAllAB(LabImage * labco, float ** varhue, float
                         bef[co] = WavCoeffs_ab[dir][co];
                     }
                     klev =  (wavblcurve[lvl * 55.5f]);
+                    float lvr = lvl;
+                    if(lvr == 0) {
+                        lvr = 1;
+                    }
               
-                    klev *=  cp.bluwav * cp.chrwav * lvl * 25.f / skip;
+                    klev *=  cp.bluwav * cp.chrwav * lvr * 20.f / skip;
                     
                     boxblur(bef, aft, klev, Wlvl_ab, Hlvl_ab, false);