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Camera depending notes: 

- ixus800_sd700 uses Propset 1 of Properties (see http://tinyurl.com/6zbv9b)
- ixus800_sd700 does NOT have a real IRIS Diaphragm, it only has an ND Filter! 
Mind this.
- CHDK for firmware 1.01a is the SAME for 1.01b