Christie 118-100116-03 ILS1 Zoom Long-Throw Lens Overview

Christie OEM Lens 118-100116-03 ILS1 Zoom is an OEM optical accessory for Christie professional projectors. It is a long-throw lens (Long Throw) with a throw ratio of 6.90-10.40:1. The official compatibility list covers 4 models; before installation, simply verify the projector model and panel size—no adapter ring workaround is needed. The value of an OEM lens lies not in the extra figures in its specification sheet, but in the fact that it is calibrated at the factory to the optical path and lens mount of the corresponding model series: image circle, edge illumination, and focusing travel all meet their design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Christie (Christie)
Lens Model	118-100116-03 ILS1 Zoom
Throw Ratio	6.90-10.40:1
Product Type	Long Throw
Compatible Models	4 Projectors
Warranty	12 months; damage not caused by improper use is eligible for after-sales service, subject to the date shown on the sales invoice

The above specifications are based on the manufacturer's official specifications. For mechanical dimensions, flange distance, and lens-mount type not shown in the specification table, please verify them with us using the projector model. Ordering solely based on a similar model designation carries the risk that the lens will not fit.

II. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of installation distance to image width. This OEM lens is a zoom lens (6.90-10.40:1), so a given image size corresponds to a range of installation distances, and the lens can focus anywhere within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 14.84 – 22.36 m
120 inches	2.58 m	approx. 17.80 – 26.83 m
150 inches	3.22 m	approx. 22.25 – 33.54 m
200 inches	4.30 m	approx. 29.67 – 44.72 m

These distances represent the clear space from the front surface of the lens to the screen, excluding cooling clearance and cable-routing space at the rear of the projector. They are calculated for a 16:10 image; actual values must be verified on site and according to the manufacturer's manual.

Image quality differs at the two ends of the zoom range: near the short-throw end, the image is brighter and the edges are slightly softer; near the long-throw end, the edges are sharper and brightness drops slightly. Where site conditions allow, it is recommended to position the lens near the middle of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

III. Compatible Models (4 Projectors)

The table below is taken from the official compatibility list. Brightness and resolution are populated from the model database; where the data is unavailable, “—” is shown and no values are estimated.

Model	Brightness	Resolution
M 4K+15 RGB	—	—
M 4K+25 RGB	—	—
M 4K15 RGB	—	—
M 4K25 RGB	—	—

For models not included in the list, please send us photographs of the projector nameplate and the existing lens for verification—platforms from the same generation often share a lens mount, but the risk of ordering based on a similar model designation is not worth taking.

Throw Ratios by Model Series

The rated throw ratio differs among the series listed below when the same 118-100116-03 ILS1 Zoom lens is installed; choose the value according to the series of the actual projector.

Model Series	Throw Ratio
—	6.90-10.40:1

IV. Three Checks Before Replacing the Lens

• Confirm the projector chip and resolution. OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the panel, resulting in vignetting or edge illumination loss.
• Calculate the installation distance first. This lens has a rated throw ratio of 6.90-10.40:1. Apply the table in Section 2 to your site dimensions; a fixed-focus lens offers no adjustment allowance, while a zoom lens should also allow 10–20 cm of margin at both ends.
• Verify the lens mount and locking mechanism. The OEM lens is calibrated to the lens mount of the corresponding model series, and you must hear it lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking, not by a problem with the lens itself.

If you are unsure, send us one photo of each nameplate—the projector and the existing lens. Verification against the physical items is the most reliable approach.