Originally posted by pentup My K-5 is not exhibiting this problem. But perhaps I don't understand the difficulty.
Try this:
Phase 1
Set Manual mode.
Ensure that Memory settings (item 5 on the fifth page of the first tab of the menu) include a check to remember ISO. - default setting iirc
Ensure that 'Auto Power Off' (item3 on page 3 of the 3rd tab of the menu) is set to 1 minute.
Set ISO to 800.
Allow camera to go into standby and LCD screen to go blank (usually 60 seconds).
Wake camera up (usually i half depress shutter).
Note that ISO is still set to 800.
Phase 2
Set Manual mode.
Set ISO to 800.
* save settings as a user mode *
* set mode dial to 'user' and select the one you just saved - press ok *
* change ISO to 6400 *
Allow camera to go into standby and LCD screen to go blank (usually 60 seconds).
Wake camera up (usually i half depress shutter).
* Note that ISO is no longer set to 6400, but rather the same value as when you saved the user profile.*
Expected behavior:
Camera remembers ISO setting after recovering from standby mode (Auto Power Off), regardless of what mode it is in.
Actual behavior:
When in a user mode, after recovering from standby mode, camera forgets current ISO setting, and imposes ISO setting as originally saved in user mode.
This makes sense when recovering from a hard power down (main switch set to off, or battery removal), because user mode selection screen is presented when main power switch is activated to power up again.
But this does not make sense when the camera is sleeping to conserve power and no mode change/selection has been made.
Workaround:
Set 'Auto Power Off' to a much higher number or 'off'.
Caveats include higher battery use and increased likelihood of accidental button/dial activation during user inactivity.