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59
4-4. Understanding sport meter as Exposure Index (EI) assist
Measuring video level and stop settings to achieve desired exposure, can be performed easily with
the SPOT METER function.
Overwiew
The graph on the figure 4-1 shows the AU-EVA1’s V-Log gamma curve. It is designed to have the
same characteristic as the original VARICAM’s (35 and LT) curve hense, LUTs developed for
VARICAM series can also be used for the AU-EVA1’s footage, Please note that EVA1 exposure
latitude is 14 stop while VARICAM35/LT is 14.5 stops..
Fig.4-1 AU-EVA1’s V-Log curve
10-bit code value of gray with reflection of 18% is defined as 433 (42% in IRE).
Input
reflection
[%]
V-Log
IRE [%] 10bit Code value 12bit Code value
0 7.3 128 512
18 42 433 1732
90 61 602 2408
4. Understanding advanced features
+6 Stops
-8 Stops
VARICAM
+6.5 Stops
18% Gray
18%
36%
72%
144%
288%
576%
1152%
2304%
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