Christie 121-122106-XX Zoom Long-Throw Lens for 11 Compatible Projector Models

Genuine Christie Lens 121-122106-XX Zoom is an original optical accessory for Christie engineering projectors, featuring a long throw ratio of 2.43-3.69:1. The factory compatibility list covers 11 projector models. Before installation, simply verify the chassis model and panel size—there is no need to make do with adapter rings. The value of a genuine lens lies not in the extra rows of figures in its specifications, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focus travel all meet the intended design values, so there is no need to compensate for image quality with keystone correction.

1. Lens Specifications

Brand	Christie (Christie)
Lens Model	121-122106-XX Zoom
Throw Ratio	2.43-3.69:1
Product Type	Long Throw
Compatible Models	11 models
Warranty	12 months; after-sales service is available for damage not caused by the user, based on the date on the shipping invoice

These 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 your projector model. Ordering based solely on a similar model carries a risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine zoom lens (2.43-3.69:1) covers a range of installation distances for each image size and can be focused at any point within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 5.22 – 7.93 m
120 inches	2.58 m	approx. 6.27 – 9.52 m
150 inches	3.22 m	approx. 7.84 – 11.90 m
200 inches	4.30 m	approx. 10.45 – 15.87 m

These figures represent the clear distance from the front surface of the lens to the screen and do not allow for cooling clearance or space for cable connections at the rear of the projector. They are calculated for a 16:10 image; actual distances should be confirmed through on-site measurement and the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness decreases slightly. Where venue conditions allow, use the middle of the range. After installation, first find the sharpest image position using the focus ring, then fine-tune the lens shift.

3. Compatible Models (11 Models)

The following table is taken from the factory compatibility list. Brightness and resolution are populated from the model database; unavailable specifications are marked with «—», and no estimates are made.

Model	Brightness	Resolution
DHD1052-Q	9500 lumens	1920x1080
DHD851-Q Black	—	—
DHD851-Q White	—	—
DHD951-Q	8200 lumens	1920x1080
DWU851-Q Black	—	—
DWU851-Q White	—	—
DWU951-Q	8500 lumens	1920x1200
DWX851-Q Black	—	—
DWX851-Q White	—	—
DWX951-Q	8500 lumens	1280x800
DWX951-Q White	8500 lumens	1280x800

To verify whether a model outside the list is compatible, send us photographs of the projector nameplate and the existing lens. Platforms from the same generation often share the same mount, but ordering based solely on a similar model is not worth the risk.

Throw Ratios by Projector Series

The rated throw ratio of the same 121-122106-XX Zoom varies across the projector series listed below. When selecting a lens, use the value for the series of your actual projector.

Model Series	Throw Ratio
—	2.43-3.69:1

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. The genuine 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 light loss around the edges after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.43-3.69:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens offers no adjustment margin, while a zoom lens should still allow an additional 10–20 cm at both ends of the range.
• Verify the mount and locking mechanism. The genuine lens is calibrated to the mount of that projector series. After installation, you must hear the lock engage fully. Image skew and soft edges are usually caused by incomplete locking rather than a problem with the lens itself.

If you are unsure, take one photograph of the projector nameplate and one of the existing lens nameplate and send them to us. Verification against the actual equipment is the most reliable approach.