Arriflex D-20

Source: Wikipedia, the free encyclopedia.

The Arriflex D-20 is a film-style

CMOS sensor. The camera was discontinued in 2008 when its successor, the Arriflex D-21
, was introduced.

Overview

The D-20 uses a single CMOS sensor the width of a

35 mm film motion picture cameras
.

The D-20 captures images in two main modes:

Following recording formats are possible:

Data Mode:

  • 2880 x 2160 RAW 12 bit Bayer data @ 23.976p, 24p, 25p
  • 2880 x 1620 RAW 12 bit Bayer data @ 29.97p, 30p

HD Mode – HD-SDI (SMPTE 292M):

  • 1920 x 1080 4:2:2 YCbCr 10 bit @ 23.976, 24, 25, 29.97, 30 PsF

HD Mode – dual link HD-SDI (SMPTE 372M):

  • 1920 x 1080 4:4:4 RGB 10 bit @ 23.976, 24, 25, 29.97, 30 PsF
  • 1920 x 1080 4:2:2 YCbCr 10 bit @ 48, 50, 59.94, 60PsF*

The D-20 has a mechanical shutter, variable from 11.2° to 180° or an electronic shutter that simulates a 270° mechanical shutter at 24frame/s. The camera is capable of running at speeds from 1 to 60frame/s. Numerous components of the camera were borrowed from Arri film camera models (most notably the 435ES), assuring compatibility with Arri film camera accessories and support equipment.

Though the D-20 system is capable of variable speeds from 1 to 60 frames per second, in RAW Data mode these are currently limited to 23.976 frame/s, 24 frame/s, 25 frame/s, 29.97 frame/s & 30 frame/s per second.

The sensitivity of the D-20 in video mode is regulated by the application of LUTs (Look Up Tables) prior to output. With sensitivity settings ranging from ISO 100 to ISO 800 with linear responses, the D-20 also offers log curve options designed to mimic the response of film negative. Unlike some other digital cameras, the D-20 does not offer gain boost, instead relying on the advantages of adding gain in the post production process. The sensitivity of the camera in Data mode is regulated by applying LUTs in the outboard processing of the image.

Distinctive characteristics

Of the currently available high resolution digital motion picture cameras, the Dalsa Origin, the SI 2K and the D-20 feature detachable optical viewfinders.

Some advantages of an optical over purely electronic viewing systems include:

  • extremely high viewfinder resolution, with the option to zoom in on the image to check critical focus
  • ability to set camera framing without need of a power supply

Some disadvantages an optical viewing introduces to a camera system:

  • loss of light and sensitivity, as light has to go to the viewfinder instead of the sensor
  • no monitoring of what is recorded on the sensor, only what appears in front of the sensor.

Electronic viewing options can be added to the camera. Typically, an additional monitor is used to both view and evaluate images for the camera.

The D-20 also accepts a traditional film style video assist system, sharing the image available through the optical viewfinder. This can be useful in Steadicam and remote crane applications where visibility outside the sensor capture area is preferable.

Like Arri mechanical cameras, the D-20 is modularly constructed so that both the mechanical and electronic components are upgradable over time, the camera however was discontinued in 2008 and the D-21 was introduced.

Films shot with Arriflex D-20

Similar cameras

Other single-chip

Genesis camera, the Sony F35 camera and the Red One
camera.

External links
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