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Camera depending notes: 

- s2is uses Propset 1 of Properties (see http://tinyurl.com/6zbv9b)
- s2is does have a REAL IRIS Diaphragm, it does NOT have an an ND Filter! 
Mind this.
- CHDK for firmware 1.00i is the SAME for 1.00g
- ISO real / market conversion not know, so override values may not match
  Canon UI values. Please post on the forum if you can test