Christie 118-100111-03 ILS1 Zoom Standard Throw Projector Lens: Compatible with M 4K+15 RGB

Christie Original Lens 118-100111-03 ILS1 Zoom is a genuine optical accessory for Christie large-venue projectors, belonging to the standard throw category with a throw ratio of 1.16-1.49:1. The original compatibility list covers 4 projector models; simply verify the chassis model and panel size before installation—no adapter rings needed. The value of an original lens isn't a few extra rows of numbers on a spec sheet, but the fact that it is calibrated at the factory to the optical path and bayonet of that chassis series: once mounted, 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

Brand	Christie
Lens Model	118-100111-03 ILS1 Zoom
Throw Ratio	1.16-1.49:1
Product Type	Standard Throw
Compatible Models	4
Warranty	12 months; after-sales service available for non-human damage, based on the date on the shipping document

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and bayonet type not shown in the spec table, please verify with us against your chassis 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 a zoom lens (1.16-1.49:1), so a given image size corresponds to a range of distances; installation anywhere within this range will achieve focus.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 2.49 – 3.20 m
120 inches	2.58 m	Approx. 2.99 – 3.84 m
150 inches	3.22 m	Approx. 3.74 – 4.81 m
200 inches	4.30 m	Approx. 4.99 – 6.41 m

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

Image quality differs at the two ends of the zoom range: toward the near end the image is brighter with slightly softer edges; toward the far end edges are sharper with slightly reduced brightness. Where space permits, we recommend landing in the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the shift.

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.

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

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

Throw Ratios Across Model Series

The same 118-100111-03 ILS1 Zoom mounted on the following series has different nominal throw ratios; selection must be based on the series of the actual chassis.

Model Series	Throw Ratio
—	1.16-1.49:1

4. Three Things to Confirm Before Replacement

• Confirm the chassis chip and resolution. Original lenses are designed for specific panel sizes; with different panel specifications 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 1.16-1.49:1; use the table in Section 2 to map it to your venue dimensions. Prime lenses have no margin, and even with zoom you should allow 10–20 cm at both ends.
• Verify the bayonet and locking. Original lenses are calibrated to the chassis bayonet of that series; after installation you must hear the lock engage. Image skew and soft edges are usually due to incomplete locking, not a problem with the lens itself.

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