Christie 121-111104-XX Fixed Short-Throw Lens for 19 Models

Christie Genuine Lens 121-111104-XX Fixed is an original optical accessory for Christie professional projectors. It is a short-throw lens with a 0.80:1 throw ratio. The factory compatibility list covers 19 models. Before installation, simply verify the projector model and panel size; no adapter rings are needed. The value of a genuine lens lies not in the additional figures in its specification sheet, 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 are all at their design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

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

II. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine lens has a fixed focal length (0.80:1), so the installation distance varies linearly with the image size, with no adjustment margin. Accurate measurements are therefore essential before installation.

The distances above are the clear distances from the front of the lens to the projection screen and do not account for space behind the chassis for ventilation and cable connections. They are calculated for a 16:10 image; actual values are subject to on-site measurements and the manufacturer's manual.

III. Compatible Models (19 Models)

The following table is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the projector model database; unavailable specifications are shown as "—", with no estimates.

To verify whether a model outside the list can be used, send us photos of the projector nameplate and the existing lens. Projectors from the same generation or platform often share the same mount, but the risk of ordering based on a similar model is not worth taking.

Throw Ratios for Different Model Series

Even when the same 121-111104-XX Fixed lens is installed on the following series, the nominal throw ratio varies. Select the value corresponding to the actual projector series.

IV. Three Checks Before Replacement

• Confirm the projector panel/chip and resolution. Genuine lenses are designed for specific panel sizes. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first. Apply the rated throw ratio of 0.80:1 to your site dimensions using the table in Section II. A fixed-focal-length lens has no adjustment margin, and even a zoom lens should allow 10–20 cm of margin at both ends.
• Verify the mount and locking mechanism. Genuine lenses are calibrated to the mount of the corresponding projector series. You must hear the lens lock into place after installation. 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 photo of the projector nameplate and one of the existing lens nameplate, then send them to us. Verification against the physical items is the safest approach.