Your theory is correct, but it's not entirely possible on Sony DSC HX-100V because it's NOT an SLR.
Its a bridge cam, and even in manual mode you don't have full manual control.
While playing in A mode, you'd see that the S will be automatically set by the cam many a time and you wouldn't have complete freedom as you have with an SLR. That's a trade off one makes with a bridge cam. You can't lock controls at values you want all the time! Sometimes, the cam plays smart.








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