Christie 900-300349-01 Short Fixed Short-Throw Projector Lens: Compatible with Jazz 4K1600-JS

Christie Original Lens 900-300349-01 Short Fixed is a genuine optical accessory for Christie engineering projectors. It is a short-throw lens with a throw ratio of 0.46:1. The original compatibility list covers 4 projector models; before installation, simply verify against the projector model and panel size—no adapter rings are needed. The value of an original lens isn't about having a few more numbers in the spec sheet, but that it is calibrated at the factory to match the optical path and bayonet of that series' chassis: once mounted, the image circle, edge illumination, and focus travel are all at their design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and bayonet type that are not shown in the spec table, please verify with us against the projector model—ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of installation distance to image width. This original lens is fixed-focal (0.46:1), so the installation distance changes linearly with image size and has no adjustment margin—it must be measured accurately before installation.

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

3. Compatible Models (4)

The table below is taken from the original compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable—no speculation.

To determine whether models outside the list are compatible, please send us photos of the projector 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 Different Model Series

The same 900-300349-01 Short Fixed mounted on the following series has different nominal throw ratios; selection should be based on the actual series of the projector.

4. Three Things to Confirm Before Replacement

• Confirm the projector 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 loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.46:1; apply it to your venue dimensions using the table in Section 2. Fixed-focal lenses have no margin, and even zoom lenses should leave 10–20 cm at both ends.
• Verify the bayonet and locking. Original lenses are calibrated to the bayonet of that series' chassis; after mounting, you must hear it lock into place. Image skew and soft edges are usually caused by incomplete locking, not by the lens itself.

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