diff --git a/include/osg/Camera b/include/osg/Camera
index 23aa7591f..06e23268c 100644
--- a/include/osg/Camera
+++ b/include/osg/Camera
@@ -206,13 +206,13 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
           * Returns false if matrix is not an orthographic matrix, where parameter values are undefined.*/
         bool getProjectionMatrixAsOrtho(double& left, double& right,
                                         double& bottom, double& top,
-                                        double& zNear, double& zFar);
+                                        double& zNear, double& zFar) const;
 
         /** Get the frustum setting of a perspective projection matrix.
           * Returns false if matrix is not a perspective matrix, where parameter values are undefined.*/
         bool getProjectionMatrixAsFrustum(double& left, double& right,
                                           double& bottom, double& top,
-                                          double& zNear, double& zFar);
+                                          double& zNear, double& zFar) const;
 
         /** Get the frustum setting of a symmetric perspective projection matrix.
           * Returns false if matrix is not a perspective matrix, where parameter values are undefined. 
@@ -220,7 +220,7 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
           * Asymmetric matrices occur when stereo, power walls, caves and reality center display are used.
           * In these configurations one should use the 'getProjectionMatrixAsFrustum' method instead.*/
         bool getProjectionMatrixAsPerspective(double& fovy,double& aspectRatio,
-                                              double& zNear, double& zFar);
+                                              double& zNear, double& zFar) const;
 
 
 
@@ -240,10 +240,10 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
         void setViewMatrixAsLookAt(const osg::Vec3d& eye,const osg::Vec3d& center,const osg::Vec3d& up);
 
         /** Get to the position and orientation of a modelview matrix, using the same convention as gluLookAt. */
-        void getViewMatrixAsLookAt(osg::Vec3d& eye,osg::Vec3d& center,osg::Vec3d& up,double lookDistance=1.0);
+        void getViewMatrixAsLookAt(osg::Vec3d& eye,osg::Vec3d& center,osg::Vec3d& up,double lookDistance=1.0) const;
 
         /** Get to the position and orientation of a modelview matrix, using the same convention as gluLookAt. */
-        void getViewMatrixAsLookAt(osg::Vec3f& eye,osg::Vec3f& center,osg::Vec3f& up,float lookDistance=1.0f);
+        void getViewMatrixAsLookAt(osg::Vec3f& eye,osg::Vec3f& center,osg::Vec3f& up,float lookDistance=1.0f) const;
 
         /** Get the inverse view matrix.*/
         Matrixd getInverseViewMatrix() const;
diff --git a/src/osg/Camera.cpp b/src/osg/Camera.cpp
index c9507406f..89056864e 100644
--- a/src/osg/Camera.cpp
+++ b/src/osg/Camera.cpp
@@ -215,7 +215,7 @@ void Camera::setProjectionMatrixAsPerspective(double fovy,double aspectRatio,
 
 bool Camera::getProjectionMatrixAsOrtho(double& left, double& right,
                                            double& bottom, double& top,
-                                           double& zNear, double& zFar)
+                                           double& zNear, double& zFar) const
 {
     return _projectionMatrix.getOrtho(left, right,
                                        bottom, top,
@@ -224,7 +224,7 @@ bool Camera::getProjectionMatrixAsOrtho(double& left, double& right,
 
 bool Camera::getProjectionMatrixAsFrustum(double& left, double& right,
                                              double& bottom, double& top,
-                                             double& zNear, double& zFar)
+                                             double& zNear, double& zFar) const
 {
     return _projectionMatrix.getFrustum(left, right,
                                          bottom, top,
@@ -232,7 +232,7 @@ bool Camera::getProjectionMatrixAsFrustum(double& left, double& right,
 }                                  
 
 bool Camera::getProjectionMatrixAsPerspective(double& fovy,double& aspectRatio,
-                                                 double& zNear, double& zFar)
+                                                 double& zNear, double& zFar) const
 {
     return _projectionMatrix.getPerspective(fovy, aspectRatio, zNear, zFar);
 }                                                 
@@ -242,12 +242,12 @@ void Camera::setViewMatrixAsLookAt(const Vec3d& eye,const Vec3d& center,const Ve
     setViewMatrix(osg::Matrixd::lookAt(eye,center,up));
 }
 
-void Camera::getViewMatrixAsLookAt(Vec3d& eye,Vec3d& center,Vec3d& up,double lookDistance)
+void Camera::getViewMatrixAsLookAt(Vec3d& eye,Vec3d& center,Vec3d& up,double lookDistance) const
 {
     _viewMatrix.getLookAt(eye,center,up,lookDistance);
 }
 
-void Camera::getViewMatrixAsLookAt(Vec3f& eye,Vec3f& center,Vec3f& up,float lookDistance)
+void Camera::getViewMatrixAsLookAt(Vec3f& eye,Vec3f& center,Vec3f& up,float lookDistance) const
 {
     _viewMatrix.getLookAt(eye,center,up,lookDistance);
 }