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 - 3.0: 1 zoom lens102-935
3.0 - 4.3: 1 zoom lens102-936
Method two: Choosing a lens by calculation
For any screen size not covered by the lens charts, or if you need to be more
precise, then use the calculations below.
• Identify actual width of the image in pixels.
• Calculate the Throw Ratio Factor:TRF =
DMD width (2048)
Image width in pixels
• Identify the screen width required.
• Identify the throw distance required.
Throw distance calculations are based on the distance from the outer end of the
lens, which will vary from lens to lens. Once a lens has been chosen, the figures
can be checked using the more accurate figures given on the next page.
• Calculate the throw ratio required.Throw ratio =
Throw distance
Screen width x TRF
• Choose a lens with the required throw ratio from the list to the right.
example
• A 1.66:1 full height image, 1793 x 1080 pixels, screen width 11m, throw distance
26m from the outer end of the lens.
• Throw Ratio Factor (TRF) =
2048 = 1.142
1793
• Throw ratio required =
             26 = 2.07
11 x 1.142
• Choose the 1.8 - 2.4: 1 zoom lens 
						

							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)
Throw ratio x TRF
Throw distance = Screen width x Throw ratio x TRF
The throw distance calculated above is to the outer end of the lens. For each lens,
the nominal distance between the front of the projector and the outer end of the lens
(lens extension) will be as listed below:
lens extension
1.45 - 1.8: 1 zoom lens102-933109mm (4.3in)
1.8 - 2.4: 1 zoom lens102-93497mm (3.8in)
2.2 - 3.0: 1 zoom lens102-93553mm (2.1in)
3.0 - 4.3: 1 zoom lens102-93698mm (3.9in)
lens extension,
measured from front
of corner post 
						

							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 lever clockwise to engage the drive.
Notes
Each time a new lens is fitted
to the projector, or the zoom
drive lever is operated, the
calibration procedure MUST
be carried out. See Using the
Menus in Section
4. Controlling the projector.
Be careful not to scratch the
lens surfaces. If you do
accidentally touch a lens, then
clean the surface using a lens
paper.
The zoom drive mechanism
should always be set to the
engaged position, even when
using the non-zoom lens, as
it provides an extra level of
protection, should the lens
release lever fail.
Lens
release
lever
Zoom drive
lever
Calibrating the lens
• Each time a new lens is fitted to the projector, or the zoom drive lever is
operated, the calibration procedure MUST be carried out.
• For more information about how to do this, see the example in Using the Menus
in Section 4. Controlling the projector. 
						

							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 the periphery of the lens optics.
•  If the lens is to be shifted in two directions combined, the maximum range
without distortion will be somewhat less, as can be seen in the diagrams to the
right.
The maximum range available with no distortion is dependent on which lens is used.
The tables below show the maximum range for images that fill the DMD. For images
which do not use the full height or width, extra shift will be possible, up to the limit of
the lens mount movement.
It is physically possible to shift the lens further than this, up to the number of pixels
shown in the diagram to the right. However:
•  There will be some distortion of the image beyond the ranges specified above.
•  Due to internal hardware layout, the shift towards the upper-right is limited as
shown in the diagram.
•  Due to continuing product development, these figures may vary by ±25 pixels.
Notes
For more information on
adjusting the  projection lens,
see Displaying a test pattern
and Adjusting the projected
image  in  section 3. Getting
started.
If the lens is to be shifted in two
directions combined, the
maximum range is somewhat
less, as can be seen below.
full horizontal and vertical shift
without distortion
combined shift without distortion
is reduced
total lens mount shift available
in pixels and vs DMD size
vertical horizontal vertical horizontal
(pixels) (pixels) (vs DMD height) (vs DMD width)
± 282 ± 172 ± 0.26H ± 0.085W
640
(0.31W)384
(0.19W)
560
(0.52H)
135
449
520
(0.48H) 
						

							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 flying lead into the socket below and to the right of the lens.
Notes
Be careful not to scratch the
lens surfaces. If you do
accidentally touch a lens, then
clean the surface using a lens
paper.
The projection lens should be
fitted and adjusted before fitting
the anamorphic lens into the
lens holder.
For more information on
adjusting the  projection lens,
see Displaying a test pattern
and Adjusting the projected
image  in  section 3. Getting
started.
If the projection lens has not already been fitted, fit it now, and adjust the position
and focus. This will ensure that the lens is in the right position, so that the position of
the anamorphic lens can be adjusted correctly.
• Loosen the lens clamp, position the anamorphic lens in the lens holder, and
tighten the clamp screws.
• Loosen the slide clamp and slide the carriage in until the anamorphic lens is
approximately 2-5mm from projection lens. Tighten the slide clamp screws.
• Re-check the projection lens clearance after adjusting the alignment  (overleaf).
Support arm
Slide pole
Slide clampLens
carriageCross braceLens clampLens holder 
						

							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, and rotate the two bearings, ensuring that after
adjustment, both bearings are in contact with the horizontal support.
Vertical position
•  Adjust the two screws, ensuring that after adjustment, both screws are in contact
with the lens holder.
Horizontal position
Two microswitches are located at each end of the lens carriage, on the side nearest
the projector.  The central bracket determines the horizontal position of the lens
when the lens is moved into position.
•  Adjust the position of the central microswitch bracket.
Lens rotation
•  Loosen the lens clamp and rotate the lens within the lens holder.
Notes
Re-check the projection lens
clearance (see previous page)
after making these adjustments.
Vertical
plane
adjustment
Horizontal
plane
adjustment
Vertical
support
Horizontal
support
Vertical
position
adjustment
screws
Lens
holder 
						

							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 the screen
should be a maximum of 8 times the screen height. The screen viewing area should
be within a 60° range from the face of the screen.
The image can be flipped for rear projection (see section 4. Using the menus,
Menu trees) and displayed without the need for extra mirrors or equipment.
However, you must ensure that there is sufficient distance behind the screen for the
projector to be correctly located.
Rear installation is generally more complicated and advice should be sought from
your provider before attempting it.
Notes
The projector should be
installed as close to the
power outlet as possible.
The power connection should
be easily accessible, so that it
can be disconnected in an
emergency.
Ensure that there is at least
30cm (12in) of space between
the ventilation outlets and
any wall, and 10cm (4in) on
all other sides.
Do not install the projector
close to anything that might
be affected by its operational
heat, for instance,
polystyrene ceiling tiles,
curtains etc.
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.
For more information about
external ducting, see Fitting
the lamp duct box, later in this
section. 
						

							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 THIS MANUAL.
The projector weighs over
100kg (200lbs). Use safe
handling techniques when
lifting the projector.
Make sure that the surface
that is to support the
projector is capable of
supporting the combined
weight of the projector and
lens (see specification for
weights).
Do not place heavy objects
on top of the projector
chassis. The projector chasis
is NOT capable of
withstanding the weight of
another projector.
Do not tilt the projector more
than  ±12° from side to side
when in use, as this may
cause serious lamp failure,
damage the lamp module and
cause extra cost on
replacement. The projector
my be tilted forwards and
backwards as necessary.
Adjustable
foot
±12°
360° 
						

							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.
Installation of the lamp duct
box should be carried out
ONLY by certified service
personnel.
Duct box
fixing holes 
						

							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