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GX100 PDF manual is usually the best way to answer most of the problems and questions and should be also the first option if you search for help 
GR DIGITAL Operation Manual (PDF)
http://www.ricoh.com/r_dc/support/manua ... X100_E.pdf
GR DIGITAL Operation Manual (PDF)
http://www.ricoh.com/r_dc/support/manua ... X100_E.pdf