BenQ 5J.JCY37.001 Ultra Short Fixed Projector Lens Guide: LU9715 Compatibility

BenQ Original Lens 5J.JCY37.001 Ultra Short Fixed is a genuine optical accessory for BenQ engineering projectors. It is an ultra-short-throw (Ultra Short Throw) lens with a throw ratio of 0.38:1. BenQ's official compatibility list covers 1 projector model. Before installation, simply verify the projector model and panel size; there is no need to make do with an adapter ring. The value of an original lens lies not in additional specification figures, but in the fact that it is factory-calibrated to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focusing travel all meet their design specifications, eliminating the need to compensate for image quality with keystone correction.

I. Lens Specifications

These specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please verify the exact projector model with us. Ordering solely based on a similar model may result in an incompatible installation.

II. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of installation distance to image width. This original lens has a fixed focal length (0.38:1), so the installation distance varies linearly with image size and has no adjustment margin. Accurate measurements are essential before installation.

The distances above represent the clear distance from the front face of the lens to the projection screen and do not account for rear housing ventilation or cable-routing space. They are calculated for a 16:10 image; actual distances are subject to on-site measurements and the manufacturer's manual.

III. Compatible Projector Models (1 model)

The table below is taken from the manufacturer's official compatibility list. Brightness and resolution are retrieved from the projector model database. Where data are unavailable, “—” is shown, and no estimates are made.

To determine whether a model not listed here is compatible, please send us photographs of the projector nameplate and the existing lens for verification. Platforms from the same generation often share the same mount, but ordering solely based on a similar model carries an avoidable risk.

Throw Ratios Across Model Series

The nominal throw ratio varies by series when the same 5J.JCY37.001 Ultra Short Fixed is installed. Use the value corresponding to the actual projector series when selecting a lens.

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution. Each original 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 edge light loss.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.38:1. Use the table in Section II to match the lens to your installation site's dimensions. A fixed-focal-length lens has no adjustment margin, and even a zoom lens should allow an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that projector series. After installation, you must hear the lens lock into place. A skewed image or soft edges is usually caused by an incompletely engaged lock, rather than a problem with the lens itself.

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