Static Transforms - Where is the problem in my setup?

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Hey guys,

I am trying to set up a test scenario for calibrating cameras with markes. Therefore, I have 2 cameras and 2 markers. Each camera can see both markers. But when I try to simulate this scenario with static-transform-publisher, I get the strange effect, that I either have 2 trees like this:

marker_1 <=> camera 1
marker_2 <=> camera 2

or 1 tree like this:

marker_2 <=> camera 1
marker_2 <=> camera 2

(Which marker is paired with which camera changes constantly, the numbers are only examples)

Here is my launch-file:

 0 <launch>                   
  1 
  2     # Create static transforms for our fake cameras and markers
  3     <node pkg="tf" type="static_transform_publisher" name="marker_1_camera_front_tf_publisher" args="1.0 0 0 0 0 0 /ar_marker_1 /camera_front 10" />
  4     <node pkg="tf" type="static_transform_publisher" name="marker_2_camera_front_tf_publisher" args="1.0 1.0 0 0 0 0 /ar_marker_2 /camera_front 10" />
  5     <node pkg="tf" type="static_transform_publisher" name="marker_1_camera_top_tf_publisher" args="0 0 1.0 0 0 0 /ar_marker_1 /camera_top 10" />
  6     <node pkg="tf" type="static_transform_publisher" name="marker_2_camera_top_tf_publisher" args="0 1.0 1.0 0 0 0 /ar_marker_2 /camera_top 10" />
  7 
  8     # Launch the calibrator
  9     <include file="$(find camera_calibrator)/launch/calibrate_2_kinects.launch" />
 10 
 11 </launch>

Am I doing anythign wrong, or is my basic understanding of transforms wrong?

I monitor the transforms either via rqt or in python with tf_listener.lookupTransform(marker, camera, rospy.time(0))

Thanks in advance,

Rabe