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Camera depending notes: 

- ixus50_sd400 uses Propset 1 of Properties (see http://tinyurl.com/6zbv9b)
- ixus50_sd400 does NOT have a real IRIS Diaphragm, it only has an ND Filter! 
Mind this.

Known issues
- USB remote shoot does not work:
  http://chdk.setepontos.com/index.php?topic=11723.msg115236#msg115236