Index: /trunk/Mars/mjobs/MJSimulation.cc
===================================================================
--- /trunk/Mars/mjobs/MJSimulation.cc	(revision 19426)
+++ /trunk/Mars/mjobs/MJSimulation.cc	(revision 19427)
@@ -835,4 +835,8 @@
 
     MWriteFitsFile write3af( 2, rule3, fOverwrite?"RECREATE":"NEW", "Camera file");
+
+    if (fWriteFitsFile)
+        rule3 = "/dev/null";
+
     MWriteRootFile write3ar( 2, rule3, fOverwrite?"RECREATE":"NEW", "Camera file");