diff --git a/render_povray/__init__.py b/render_povray/__init__.py
index 82f964704910c364d0419db46c53e8fb273ad1b5..678fc49908cfec9d5986c5a6f72224651c943adf 100644
--- a/render_povray/__init__.py
+++ b/render_povray/__init__.py
@@ -1390,7 +1390,7 @@ class RenderPovSettingsMaterial(PropertyGroup):
             description="Values typically range from 0.0 to 1.0 or higher. Zero is no caustics. "
                         "Low, non-zero values give broad hot-spots while higher values give "
                         "tighter, smaller simulated focal points",
-            min=0.00, max=10.0, soft_min=0.00, soft_max=5.0, default=0.07)
+            min=0.00, max=10.0, soft_min=0.00, soft_max=5.0, default=0.15)
 
     refraction_caustics: BoolProperty(
             name="Refractive Caustics", description="hotspots of light focused when going through the material",
diff --git a/render_povray/render.py b/render_povray/render.py
index 0c212fb5f08bfff44a6bd45dfafe546a4447d949..e9f3d457d7970fb37f5cf1065d26ee3969cbf3d6 100644
--- a/render_povray/render.py
+++ b/render_povray/render.py
@@ -451,10 +451,10 @@ def write_pov(filename, scene=None, info_callback=None):
             # reflections if IOR Mirror option is checked.
             elif material.pov.mirror_use_IOR:
                 tabWrite("interior {\n")
-                tabWrite("ior %.6f\n" % material.pov.ior)
+                tabWrite("ior %.6f\n" % material.pov_raytrace_transparency.ior)
             else:
                 tabWrite("interior {\n")
-                tabWrite("ior %.6f\n" % material.pov.ior)
+                tabWrite("ior %.6f\n" % material.pov_raytrace_transparency.ior)
 
             pov_fake_caustics = False
             pov_photons_refraction = False