BS ISO 4241:2013 pdf free

BS ISO 4241:2013 pdf free.Cinematography – Projection leader (time-based), trailer and cue marks – Specifications
Orientation and dimensions of letters and numerals in this International Standard are with respect to 35 mm motion-picture films and are modified proportionally in accordance with ISO 4238 for 70 mm and 16 mm prints.
Information appearing in the leader which is printed lengthwise (in the direction of film travel) shall read from left to right when viewed from the projection lens towards the projector light source with the head end of the film at the right. Information appearing in the leader which is printed upright shall read normally when the reel is uppermost and the head of the film hangs down ready for threading (see Figures 1 and 5 for orientation of information).
All frames in the head-leader and trailer-leader identification sections (see 5.3 and 7.3) and in frames 1 through 171 of the head-leader synchronizing section (see 5.4) shall be masked to the nominal
anamorphic projection aperture [20,95 mm (0,825 in) × 17,53 mm (0,690 in)] with clear framelines nominally the height of anamorphic projection aperture framelines [1,55 mm (0,061 in)]. Frames 172 through 218 of the head-leader synchronizing section and frames 1 through 87 of the trailer-leader runout
section shall be masked to the nominal anamorphic camera aperture [21,95 mm (0,864 in) × 18,59 mm (0,732 in)] with clear framelines nominally the height of anamorphic camera-aperture framelines [0,41 mm (0,016 in)].
Because many types of film may be used for leaders, exact neutral densities have not been specified. For the purpose of this International Standard, the following approximate neutral densities are referred to:
一clear (neutral density less than 0,35);
一black (neutral density greater than 1,95).
The protective section of the leader shall consist of a minimum of 2,44 m (8 linear feet) of transparent or raw stock. When the protective leader has been reduced to a length of 1,83 m (6 linear feet), it shall be restored to its original length. Logos, trademarks, part titles, or other extraneous materials, if absolutely
necessary, should be placed in this section.BS ISO 4241 pdf download.