Panasonic VariCam LT Operating Manual page 70

[EI]
Sets the sensitivity of the video.
Dual native ISO
The camera is equipped with two [NATIVE ISO], [800ISO] and [5000ISO], which are called as dual native ISO.
By installing the sensitivity switching circuit inside the image sensor, a high sensitivity and low noise [5000ISO] is realized.
However, the sensitivity will drop 1Stop when [MAIN PIXEL] is set to [2048×1080 CROP]/[1920×1080 CROP] and [MAIN CODEC] is set to
[AVC-Intra2K-LT]/[AVC-Intra-LT]. [NATIVE ISO] will become [400ISO] and [2500ISO].
The latitude will decrease according to the value when ISO range lower than [NATIVE ISO] is used.
r Change of noise in shadow area by the ISO sensitivity
When [MAIN CODEC] is set to anything other than [AVC-Intra2K-LT]/
[AVC-Intra-LT]
Conventional element
Noise
800
Dual native ISO
Noise
800
r Change in latitude by the ISO sensitivity
When [MAIN CODEC] is set to anything other than [AVC-Intra2K-LT]/
[AVC-Intra-LT]
Dual native ISO
Latitude
Standard
(14+Stop)
-1Stop
-2Stop
200 400 800
Chapter 4 Video Recording and Color Grading — Image quality adjustment
4000 5000
ISO sensitivity
4000 5000
ISO sensitivity
1250 2500 5000
ISO sensitivity
When [MAIN CODEC] is set to [AVC-Intra2K-LT]/[AVC-Intra-LT]
Conventional element
Noise
400
Dual native ISO
Noise
400
When [MAIN CODEC] is set to [AVC-Intra2K-LT]/[AVC-Intra-LT]
Dual native ISO
Latitude
Standard
(14+Stop)
-1Stop
-2Stop
200 400
– 70 –
2000 2500
ISO sensitivity
2000 2500
ISO sensitivity
800 1250 2500 5000
ISO sensitivity