What kind of effects does base ISO sensitivity provide?

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To get the most out of the high-sensitivity sensor performance, the base sensitivity setting on the camcorder can be changed to extend the ISO upper limit to 409600(*1) for shooting in dark locations (The ISO upper limit for the FS5II is 32000(*2).

Additionally, the base sensitivity during S-Log3 shooting is fixed to ISO2000 for the FS5II, and you can select either a standard base sensitivity of ISO800 or high sensitivity of ISO12800 for dark environments. This effectively expands the shooting range.
Moreover, a wide latitude of 15+ stops enables video recording in environments with a wide range of light levels while suppressing blown-out highlights and blocked up shadows. The high-sensitivity full-size sensor, together with the camcorders ease of mobility, enables high-quality video production in any shooting environment.

*1 When Shooting Mode is set to Custom
*2 When Picture Profile is set to Standard