NEC Is15-2k Digital Cinema Projector User Manual

page 2.15
iS15-2K Cinema Projector: User Manual 2. Installation
Notes
The Throw ratio for a particular
lens is fixed, but assumes that
the image fills the width of the
DMD.
For images that do not fill the
width of the DMD, the Throw
ratio is effectively increased. To
correct for this in these
calculations, a Throw Ratio
Factor (TRF) is used.
The lenses available and their
part numbers are listed below:
1.45 - 1.8: 1 zoom lens102-933
1.8 - 2.4: 1 zoom lens102-934
(note: these two lenses overlap)
2.2 -...

page 2.16
2. InstallationiS15-2K Cinema Projector: User Manual
Notes
Lens extension is measured
when the lens is focussed at
infinity, and fully extended. At
other focus settings, the
extension could be up to 10mm
less
Useful lens formulae and constants
The following lens calculations may be useful:
Throw ratio =
Throw distance
Screen width
Throw ratio factor (TRF) =
DMD width in pixels =2048
image width in pixels image width in pixels
Therefore:
Screen width =
Throw distance (from outer end of lens)...

page 2.17
iS15-2K Cinema Projector: User Manual 2. Installation
Fitting the projection lens
• Turn the lens release lever anti-clockwise to open the lock.
• Turn the zoom drive lever anti-clockwise to disengage the drive.
• Insert the lens into the lens aperture, making sure that the two notches on the
lens engage with the locating tab inside the lens mount.
• Turn the lens release lever clockwise to lock the lens in place. When the lock is
fully closed, the lever should feel loose.
• Turn the zoom drive...

page 2.18
2. InstallationiS15-2K Cinema Projector: User Manual
Shifting the image
The normal position for the projector is at the centre of the screen. However, you
can set the projector above or below the centre, or to one side, and adjust the image
using the Lens shift feature to maintain a geometrically correct image.
•  Any single adjustment outside the ranges specified below may result in an
unacceptable level of distortion, paricularly at the corners of the image, due to
the image passing through...

page 2.19
iS15-2K Cinema Projector: User Manual 2. Installation
Fitting the anamorphic lens
The anamorphic lens mount may be supplied as a partially disassembled kit . If
necessary, follow these instructions to assemble:
• Attach the two support arms to the front corner posts of the projector, ensuring
that the slide poles are parallel to each other.
• Loosen the two slide clamps and slide the lens carriage onto the slide poles.
• Attach the cross brace to the ends of the support poles.
• Connect the...

page 2.20
2. InstallationiS15-2K Cinema Projector: User Manual
Adjusting the anamorphic lens
Before use, the anamorphic lens needs to be adjusted so that:
•  it is parallel to the projection lens in both horizontal and vertical planes,
• the centres of the two lenses are in line, and
• the anamorphic image expansion is horizontal.
Vertical plane
•  Adjust the two screws, ensuring that after adjustment, both screws are in contact
with the vertical support.
Horizontal plane
•  Loosen the locking screws,...

page 2.21
iS15-2K Cinema Projector: User Manual 2. Installation
Positioning the screen and projector
For optimum viewing, the screen should be a flat surface perpendicular to the floor.
The bottom of the screen should be 1.2m (4 feet) above the floor and the front row
of the audience should not have to look up more than 30° to see the top of the
screen.
The distance between the front row of the audience and the screen should be at
least twice the screen height and the distance between the back row and...

page 2.22
2. InstallationiS15-2K Cinema Projector: User Manual
Mounting the projector
The four adjustable feet under the chassis allow the projector to be lowered onto a
flat surface without any danger of hands being trapped between the carrying handle
and the surface.
Levelling
Once in position, adjustment of projector level should be made by turning the four
feet under the chassis
Notes
BEFORE INSTALLING THE
PROJECTOR, READ ALL THE
WARNINGS BELOW AND ALL
THOSE IN IMPORTANT
INFORMATION AT THE
FRONT OF...

page 2.23
iS15-2K Cinema Projector: User Manual 2. Installation
Fitting the lamp duct box
If the lamp duct box is to be used to duct the hot exhaust air from the lamp, this
should be fitted using the four screw holes in the lamp compartment door.
Standard 200mm ducting can be used to connect the box to the projection room air
extraction system.
Notes
If the projector must be
mounted close to people or
heat sensitive equipment,
then external ducting will be
required to remove the hot
exhaust air safely....

page 2.24
2. InstallationiS15-2K Cinema Projector: User Manual
Connecting the projector
Typical connections
HD-SDI source
DVI-D source
DVI A or B SDI A or B
LAN 1 or 2
USB BPC Control (RS232)
Remote Control