Christie 118-100117-02 ILS1 Fixed Standard Throw Projector Lens: M 4K+15 RGB, M 4K+25 RGB

Christie Original Lens 118-100117-02 ILS1 Fixed is a genuine optical accessory for Christie large-venue projectors, belonging to the standard throw category with a throw ratio of 1.10:1. The original compatibility list covers 4 projector models; before installation, simply verify against the projector model and panel size — no adapter rings needed. The value of an original lens isn't in a few extra rows of numbers on a spec sheet, but in the fact that it is calibrated at the factory to the optical path and lens mount of that projector series: once installed, the image circle, edge illumination, and focus travel all match design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and mount type not shown in the spec table, please verify with us against your projector model — ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is fixed-focal (1.10:1), so the installation distance changes linearly with image size and there is no adjustment margin — it must be measured accurately before installation.

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space behind the projector body. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

3. Compatible Models (4)

The table below is taken from the original manufacturer's compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable — no speculation.

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

Throw Ratios Across Different Model Series

The same 118-100117-02 ILS1 Fixed lens has different nominal throw ratios when mounted on the following series; selection must be based on the series of the actual projector body.

4. Three Things to Confirm Before Replacement

• Confirm the projector's chip and resolution. Original lenses are designed for specific panel sizes; if the panel specifications differ, the image circle cannot cover the screen, resulting in vignetting or edge light falloff after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 1.10:1; apply it to your venue dimensions using the table in Section 2. Fixed-focal lenses have no margin, and even zoom lenses should leave 10–20 cm at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the lens mount of that projector series; after installation, you must hear the lock click into place. Image skew and soft edges are usually caused by incomplete locking, not by the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us — verification against the actual hardware is the safest approach.