Christie 118-130105-03 ILS1 Zoom Standard-Throw Lens Guide

Christie Original Lens 118-130105-03 ILS1 Zoom is an original optical accessory for Christie engineering projectors with a Standard Throw design and a throw ratio of 0.80-1.16:1. The original compatibility list covers 4 projector models. Before installation, simply verify the projector model and panel size; there is no need to use an adapter ring. The value of an original lens lies not in the extra rows of specifications, but in its factory calibration to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focusing travel all match the design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Christie (Christie)
Lens Model	118-130105-03 ILS1 Zoom
Throw Ratio	0.80-1.16:1
Product Type	Standard Throw
Compatible Projector Models	4 models
Warranty	12 months; for damage not caused by improper use, after-sales service is available, based on the date on the dispatch documentation.

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with the projector model. Ordering directly based on a similar model carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This original lens is a zoom lens (0.80-1.16:1), so a given image size corresponds to a range of installation distances, and it can focus anywhere within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 1.72 – 2.49 m
120 inches	2.58 m	Approx. 2.06 – 2.99 m
150 inches	3.22 m	Approx. 2.58 – 3.74 m
200 inches	4.30 m	Approx. 3.44 – 4.99 m

These are the clear distances from the front surface of the lens to the screen and do not allow for cooling and cable connection space behind the chassis. The values are based on a 16:10 image format; actual distances should be confirmed by on-site measurement and the manufacturer's manual.

Image quality varies between 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 is slightly lower. Where the venue allows, we recommend positioning the projector near the middle of this range. After installation, find the sharpest image using the focus ring, then fine-tune the lens shift.

III. Compatible Projector Models (4 Models)

The following table is taken from the original compatibility list. Brightness and resolution have been populated from the model database. Unavailable values are marked — and have not been estimated.

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

To check whether a model not on the list can use this lens, please send us photos of the projector nameplate and existing lens for verification—platforms of the same generation often share mounts, but the risk of ordering based on a similar model is not worth taking.

Throw Ratio by Projector Series

When the same 118-130105-03 ILS1 Zoom is installed on the following series, the nominal throw ratio is not the same. When selecting a lens, use the value for the actual projector series.

Projector Series	Throw Ratio
—	0.80-1.16:1

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution. The original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.80-1.16:1. Apply the Section 2 table to your venue dimensions; a fixed-focus lens offers no adjustment margin, and even a zoom lens requires an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that projector series, and you must hear it lock into place after installation. A skewed image or soft edges is usually caused by an incompletely locked lens, not by the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the nameplate on the existing lens. Verification against the actual hardware is the safest approach.