Christie 118-130105-XX Short Zoom Lens Guide: Crimson HD25/HD31 Fit

Christie Original Lens 118-130105-XX Short Zoom is an original optical accessory for Christie engineering projectors. It is a standard-throw lens with a throw ratio of 0.80-1.16:1. The original compatibility list covers 2 projector models. Before installation, verify the projector model and panel size; no adapter ring workaround is needed. The value of an original lens lies not merely in the additional figures on its specification sheet, but in its factory calibration to the optical path and lens mount of the corresponding projector series. Once installed, the image circle, edge illumination, and focus travel all meet the design specifications, eliminating the need for keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Christie (Christie)
Lens Model	118-130105-XX Short Zoom
Throw Ratio	0.80-1.16:1
Product Type	Standard Throw (Standard Throw)
Compatible Models	2 projectors
Warranty	12 months; after-sales service is available for damage not caused by the user, subject to the date shown on the shipping invoice

The above specifications are subject to the original factory specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications, please contact us with the projector model. Ordering solely 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 zoom lens has a throw ratio of 0.80-1.16:1. The same image size corresponds to a range of installation distances, and the lens can focus at any position 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 figures represent the clear distance from the front of the lens to the screen and do not include space behind the projector for cooling and cabling. They are calculated for a 16:10 image; actual values should be verified through on-site measurements and confirmed against the original factory manual.

Image quality varies at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and the image is slightly dimmer. Where venue conditions allow, use a position near the middle of the range. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

III. Compatible Models (2 projectors)

The following table is taken from the original factory compatibility list. Brightness and resolution are populated from the model database; unavailable values are marked with “—” and have not been estimated.

Model	Brightness	Resolution
Crimson HD25	—	—
Crimson HD31	—	—

To confirm whether a model outside the list is compatible, send us a photo of the projector nameplate and the existing lens. Projectors based on the same-generation platform often share the same lens mount, but ordering based solely on a similar model name is not worth the risk.

Throw Ratios for Different Model Series

The nominal throw ratio varies by series when the same 118-130105-XX Short Zoom lens is installed. Select the value based on the actual projector series.

Model Series	Throw Ratio
—	0.80-1.16:1

IV. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution.Each 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.
• Calculate the installation distance first.This lens has a nominal throw ratio of 0.80-1.16:1. Use the table in Section II to calculate the distance for your venue. Fixed-focus lenses offer no adjustment margin, and zoom lenses require 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism.The original lens is calibrated to the lens mount of the corresponding projector series. After installation, confirm that it locks into place by sound. A skewed image or soft edges usually indicate that the lens is not fully locked, rather than a problem with the lens itself.

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