Canon EOS C300 Mark II CINEMA RAW DEVELOPMENT INSTRUCTION MANUAL Version 1.4 M - Page 8

Dual Rotary Turret ND Control System - sensor

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3.2 Dual Rotary Turret ND Control System The original C300 deployed a four-bayonet system of ND filters as shown in Figure 11 - offering four levels of light control to the image sensor. In general these covered most real world scene illumination situations. However, there were those who produced documentaries in regions of the world where midday sunlight levels were unusually intense and required more than the maximum of 6-stops. In some other situations where shooting was in bright sunlight the desire to open the lens aperture to decrease the depth of field of a given scene also called for a higher ND level. Accordingly, a dual rotary turret system has been deployed in the new C300 Mark II as illustrated in Figure 11 which allows selection of six levels of light transmission into the image sensor. Figure 11 On the left is shown the switchable ND bayonet system of the EOS C300 and on the right the new dual rotary turret system incorporated into the EOS C300 Mark II This very wide range of ND filters allows great latitude in setting both camera ISO and lens aperture to achieve very shallow depth of field and beautiful bokeh even in extremely bright sunlight. As shown in Table 1 a 10-stop ND, ISO set to 200, and the lens aperture set to T2.8 in extremely high scene illuminance will produce a very shallow depth of field. TABLE 1 7

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3.2
Dual Rotary Turret ND Control System
The original C300 deployed a four-bayonet system of ND filters as shown in Figure 11 – offering
four levels of light control to the image sensor.
In general these covered most real world scene
illumination situations.
However, there were those who produced documentaries in regions of
the world where midday sunlight levels were unusually intense and required more than the
maximum of 6-stops.
In some other situations where shooting was in bright sunlight the desire
to open the lens aperture to decrease the depth of field of a given scene also called for a higher
ND level.
Accordingly, a dual rotary turret system has been deployed in the new C300 Mark II
as illustrated in Figure 11 which allows selection of six levels of light transmission into the image
sensor.
Figure 11
On the left is shown the switchable ND bayonet system of the EOS C300 and on the right
the new dual rotary turret system incorporated into the EOS C300 Mark II
This very wide range of ND filters allows great latitude in setting both camera ISO and lens
aperture to achieve very shallow depth of field and beautiful bokeh even in extremely bright
sunlight. As shown in Table 1 a 10-stop ND, ISO set to 200, and the lens aperture set to T2.8 in
extremely high scene illuminance will produce a very shallow depth of field.
TABLE 1
7