diff --git a/intern/cycles/blender/addon/enums.py b/intern/cycles/blender/addon/enums.py
index a98a6aab4c4..82b48973ca1 100644
--- a/intern/cycles/blender/addon/enums.py
+++ b/intern/cycles/blender/addon/enums.py
@@ -57,8 +57,7 @@ aperture_types = (
 
 panorama_types = (
     ('EQUIRECTANGULAR', "Equirectangular", "Render the scene with a spherical camera, also known as Lat Long panorama"),
-    ('FISHEYE_EQUIDISTANT', "Fisheye Equidistant", "Ignore the sensor dimensions"),
+    ('FISHEYE_EQUIDISTANT', "Fisheye Equidistant", "Ideal for fulldomes, ignore the sensor dimensions"),
     ('FISHEYE_EQUISOLID', "Fisheye Equisolid",
-                          "Similar to most fisheye modern lens, takes sensor dimensions into consideration "
-                          "(for fulldomes use it with a square sensor ratio)"),
+                          "Similar to most fisheye modern lens, takes sensor dimensions into consideration"),
     )
diff --git a/intern/cycles/kernel/kernel_projection.h b/intern/cycles/kernel/kernel_projection.h
index 64747bcb42e..6516b9e4d82 100644
--- a/intern/cycles/kernel/kernel_projection.h
+++ b/intern/cycles/kernel/kernel_projection.h
@@ -98,7 +98,7 @@ __device float3 fisheye_to_direction(float u, float v, float fov)
 		return make_float3(0.0f, 0.0f, 0.0f);
 
 	float phi = acosf((r != 0.0f)? u/r: 0.0f);
-	float theta = asinf(r) * (fov / M_PI_F);
+	float theta = r * fov * 0.5f;
 
 	if(v < 0.0f) phi = -phi;