ARRI ALEXA 35, Руководство пользователя, Страница: 38 / 117

Main Parameters 38
Setting the Exposure Index
► Select
HOME > EI
to set the exposure index.
Following options are available:
160
200
250
320 400
500
640
800 1000
1280
1600
2000 2560
3200
4800
6400 2560 ES
3200 ES
4800 ES
6400 ES
User Buttons
EI Increase
and
EI Decrease
support to quickly change the exposure index.
Enhanced Sensitivity
In addition to the regular exposure index from EI 160 to EI 6400, it is possible to choose EI 2560 to EI
6400 with Enhanced Sensitivity (ES) turned on. Enhanced Sensitivity is an in-camera noise reduction
that provides cleaner images in low light. ES is an in-camera process, which means it is baked into
ARRIRAW and ProRes files. There also are some frame rate and shutter limits, which will be shown in
the Info Pane visible in the exposure index screen.
9.5 ND Filter
The ALEXA 35 has a built-in motorized and sealed filter stage for Full Spectrum Neutral Density filters
(FSND) with densities of 0.6, 1.2 and 1.8 (and an optical clear filter). In comparison to IRND filters,
which have an uneven spectral behavior, or to an ordinary ND filter, which opens up at about 675 nm,
the FSND filters offer a true, even light attenuation over the whole spectrum. This prevents artifacts
from infrared wavelengths and the need for additional IR filters.
► Select
HOME > ND to set the ND filter.
User Buttons ND Increase and ND Decrease support to quickly change the ND filter.
9.6 White Balance
White Balance (WB) is the color balance of the camera that should be matched to the color temperature
of the light in use. White balance is a red-blue adjustment of the image. To adjust the green-magenta
balance, use the color compensation (CC) adjustment. For example, a fluorescent source will have
peaks in its spectrum that cannot be corrected with red-blue white balance alone. The CC shift can
correct these peaks up to a full green or full magenta gel. One step of CC shift is equal to 035 Kodak
CC values or 1/8 Rosco values.
► Select
HOME > WB
to set the white balance.
► Select a preset from the list or
add
a custom white balance.
User Buttons WB Increase and WB Decrease support to quickly change between white bal-
ance presets.
Automatic white balance calculates the white balance based on the camera's live image and overwrites
the active white balance value. The result is stored as the first entry in the WB list.
► Select
HOME > WB and press Auto WB .
The monitoring outputs display an overlay indicating the area used for white balance calculation.
► Press the Auto WB button again within one second to execute automatic white balance.
The calculated white balance is set and stored as the first entry in the white balance list.