Alac-2 Function - Sony HDC-25 Series Technical Information

Technical Information: Sony HD System Cameras
P04 <GAMMA>
 TABLE
The standard curves (1~7) are for conventional broadcast applications (incl. ITU-709,
SMPTE-240M...) whereas the Hyper-Gamma curves (1~4) offer a more smooth
highlight reproduction and were designed to match drama and cinematography
applications. Hyper-Gamma is usually selected if a post-production process is
involved.

5.4.3. ALAC-2 Function

The new HXC-D70 is equipped with the latest generation of the ALAC function. ALAC
is the abbreviation for Auto Lens Aberration Correction and can minimize chromatic
aberration effects in the picture, usually visible at high contrast edges.
Each lens shows chromatic aberrations due to the different wavelength of the colours.
Especially zoom lenses suffer from chromatic errors which cannot be avoided.
HXC-D70 is equipped with the improved 2
correct chromatic errors in horizontal and vertical direction.
To make use of the ALAC functionality, a lens which supports ALAC function has to
be employed. All modern zoom lenses do support this function and in case of any
doubt please contact the lens manufacturer.
Picture 39: Impact of ALAC-2 function
The ALAC-2 function minimizes chromatic aberration effects but cannot compensate
to 100%. This is not a malfunction but a technical limitation.
V6.0 / 03-2014
o STANDARD GAMMA
1 / 2 / 3 / 4 / 5 / 6 / 7
o HYPER GAMMA
1 / 2 / 3 / 4
nd
generation ALAC function, which can
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