Pentax ist - Manual (Page 140)

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CUSTOM FUNCTIONS
[CF5] Setting the film speed manually
The film speed of DX-coded film can be set automatically or
manually.
• Custom Function number [CF5]
• Setting number
[1] . . . .Sets film speed automatically
[2] . . . .Sets film speed manually
[CF6] Superimposing the focus points
• Custom Function number [CF6]
• Setting number
[1] . . . .Superimposes the focus points
[2] . . . .Disables the superimpose
function
[CF7] Enabling shutter release before the built-in flash is fully
charged
• Custom Function number [CF7]
• Setting number
[1] . . . .Disables shutter release until
the flash is ready
[2] . . . .Enables shutter release before
the flash is charged