Christie 38-809071-61 HB Fixed Standard Throw Lens for Roadie 4K25 Roadie 4K35 Roadie 4K45

Christie OEM Lens 38-809071-61 HB Fixed is an OEM optical accessory for Christie engineering projectors. It is a Standard Throw lens with a throw ratio of 0.93:1. The factory compatibility list covers 3 models; before installation, simply verify the projector model and panel size without resorting to adapter rings. The value of an OEM lens lies not in the extra figures in a specification sheet, but in factory calibration to the optical path and mount of that series: once installed, the image circle, edge illumination, and focusing travel all meet their 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 specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please verify them with us based on the projector model; ordering solely based on a similar model carries the risk that the lens will not fit.

II. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens has a fixed focal length (0.93:1), so the installation distance changes linearly with the image size and offers no adjustment margin. Accurate measurements are essential before installation.

The above distances are the clear distances from the front face of the lens to the screen and do not account for rear housing ventilation or cabling space. They are calculated for a 16:10 image; actual distances should be confirmed through on-site measurement and in accordance with the manufacturer's manual.

III. Compatible Models (3 Models)

The table below is taken from the factory compatibility list. Brightness and resolution have been populated from the model database; where the data is unavailable, “—” is shown rather than estimated.

To confirm whether a model not on the list is compatible, please send us photos of the projector nameplate and the existing lens. Platforms of the same generation often share the same mount, but the risk of ordering based solely on a similar model name is not worth taking.

Throw Ratios by Projector Series

The nominal throw ratio varies by series when the same 38-809071-61 HB Fixed lens is installed on the following series, so select the value for the series of the actual projector.

IV. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution.OEM 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.This lens has a nominal throw ratio of 0.93:1. Use the table in Section II to calculate the distance for your installation site. A fixed-focus lens offers no adjustment margin, and even zoom lenses require an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism.The OEM lens is calibrated for the mount of that projector series, and you must hear it click into the locked position after installation. A skewed image or 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 photo of the existing lens nameplate and send them to us. Verification against the actual hardware is the safest approach.