Sony PXW-FS7 Quick Reference Manual page 58

F. Detailed guide to the Cine El Mode
F1.5 One issue with most LUT's is that the LUT cannot
show you your full recording range. There is however a
simple way to check the full range of the recordings by
using a function called "High/Low Key".
Before you can use this function you must first assign
it to one of the cameras assignable buttons. I suggest
assigning it to button <2> the "Iris" button as this button
has no effect in the Cine EI mode.
MENU: System – Assignable Button - <2> - High/Low Key
Once assigned to a button, one press of the button will
show the "High" exposure range allowing you to view how
the highlights within the scene are being recorded. This is
an easy way to check for any highlight clipping issues. The
second press of the button will show the low key or darker
parts of the scene allowing you to see how well the camera
is seeing in to the deepest shadows. The third press of the
buttons returns to view to the LUT's normal range.
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