Christie 121-111104-01 Fixed Standard-Throw Lens for LW651i-D/LW751i-D Black/White

Christie Genuine Lens 121-111104-01 Fixed is an OEM optical accessory for Christie professional projectors. It is a standard-throw lens with a throw ratio of 0.81:1. The manufacturer’s compatibility list covers 4 models. Before installation, simply verify the projector model and panel size—there is no need to make adapter rings do the job. The value of a genuine lens lies not in a few extra rows of specifications, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series: image circle coverage, edge illumination, and focusing travel are all engineered to design values, eliminating the need to compensate for image quality with keystone correction.

I. Lens Specifications

The above specifications are subject to the manufacturer’s official specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please check with us using the projector model. Ordering based solely on a similar model carries the risk of an incompatible fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This genuine lens has a fixed focal length (0.81:1), so the installation distance changes linearly with image size, with no adjustment margin. Accurate measurements must be taken before installation.

These figures represent the clear distance from the front of the lens to the screen and do not include space for rear cooling and cabling. They are calculated for a 16:10 image; actual measurements and the manufacturer’s manual take precedence.

III. Compatible Projector Models (4 Projectors)

The following table is taken from the manufacturer’s compatibility list. Brightness and resolution have been populated from the model database; where the data is unavailable, “—” is shown and no assumptions are made.

To check whether a model outside the list is compatible, please send us photos of the projector nameplate and the existing lens. Projectors from the same generation often share the same mount, but placing an order based only on a similar model is not worth the risk.

Throw Ratios Across Model Series

The nominal throw ratio of the same 121-111104-01 Fixed lens varies across the series listed below. Use the value for the series to which your projector actually belongs.

IV. Confirm Three Things Before Replacement

• Confirm the projector imaging chip and resolution.Each genuine lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image area, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first.This lens has a nominal throw ratio of 0.81:1. Apply the table in Section II to your site dimensions. A fixed-focal-length lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism.Each genuine lens is calibrated to the mount of its projector series. After installation, you must hear the lock engage. A skewed image or soft edges are usually caused by an incompletely engaged lock 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 physical equipment is the most reliable approach.