Sony PXW-FS7 Quick Reference Manual page 63

F. Detailed guide to the Cine El Mode
The cameras total dynamic range does not change when
you adjust the EI. What you are doing is altering the mid
point of the dynamic range. Using a low EI results in a
brighter S-Log recording with a deeper shadow range but
reduce highlight range. Using a high EI (it is not normally
advisable to exceed 2000 EI) results in a reduced shadow
range but increased highlight range. you are shooting an
extremely bright scene where highlights are a concern
then you can use a high EI to give more over exposure
headroom. When you shoot with a high EI the images
scene via the LUT will be brighter than normal.
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