diff --git a/glsl/michelson.frag b/glsl/michelson.frag
index f0c374c..124da46 100644
--- a/glsl/michelson.frag
+++ b/glsl/michelson.frag
@@ -47,27 +47,23 @@ void main() {
     float relX = (pixelX - center.x) * zoom;
     float relY = (pixelY - center.y) * zoom;
    
-
     // r^2
     float radiusSq = relX * relX + relY * relY;
 
-    // Diff de marche lamme d'air 2 * e cos(i) mais petits angles => cos(i) ~ 1 - i^2/2 mais i ~ r/f et r^2 = x^2 + y^2
-    float ringFactorBase = radiusSq * 0.065;
-
     // Diff de marche du au coin d'air
     float wDelta = (relX * angleM1 + relY * angleM1_Y) * 200.0;
 
-    float currDeltaBase = deltaLnm + wDelta;
+    float cosFactor = 1.0 - (radiusSq * 0.000004);
 
-    float currDelta = deltaLnm - ringFactorBase + wDelta;
+    float currDelta = (deltaLnm * cosFactor) + wDelta;
 
     vec3 accumColor = vec3(0.0);
 
     for(int i = 0; i < 10; i++) {
-        if (i >= lambdasCount) break;
+    if (i >= lambdasCount) break;
         float l = lambdas[i];
+        if (l < 1.0) l = 550.0;
         vec3 baseColorVec = WavelengthToRGB(l);
-        float currDelta = currDeltaBase - ringFactorBase;
         float K = PI / l;
         float phase = currDelta * K;
         float intensity = cos(phase);
diff --git a/glsl/michelson_web.frag b/glsl/michelson_web.frag
index f171a89..cc85e97 100644
--- a/glsl/michelson_web.frag
+++ b/glsl/michelson_web.frag
@@ -45,9 +45,12 @@ void main() {
     float relY = (pixelY - center.y) * zoom;
     
     float radiusSq = relX * relX + relY * relY;
-    float ringFactorBase = radiusSq * 0.065;
+
     float wDelta = (relX * angleM1 + relY * angleM1_Y) * 200.0;
-    float currDeltaBase = deltaLnm + wDelta;
+
+    float cosFactor = 1.0 - (radiusSq * 0.000004);
+
+    float currDelta = (deltaLnm * cosFactor) + wDelta;
 
     vec3 accumColor = vec3(0.0);
 
@@ -55,15 +58,16 @@ void main() {
         if (i >= lambdasCount) break; 
         
         float l = lambdas[i];
-        
         if (l < 1.0) l = 550.0; 
 
         vec3 baseColorVec = WavelengthToRGB(l);
-        float currDelta = currDeltaBase - ringFactorBase;
+        
         float K = PI / l;
         float phase = currDelta * K;
+        
         float intensity = cos(phase);
-        intensity = intensity * intensity;
+        intensity = intensity * intensity; 
+        
         accumColor += baseColorVec * intensity;
     }
 
diff --git a/main.c b/main.c
index 160ddfd..74d2467 100644
--- a/main.c
+++ b/main.c
@@ -571,7 +571,7 @@ int main () {
     #endif
 
     mic.center = (Vector2){ UI_WIDTH + (1920 - UI_WIDTH) / 2.0f - 100, 1080 / 2.0f };
-    mic.d1 = 250.0f;
+    mic.d1 = 300.0f;
     mic.d2 = 250.0f;
     mic.lambdas[0] = 550.0f;
     mic.lambdasCount = 1;