BenQ 5J.JAM37.021 Wide Zoom Standard Throw Lens for 9 Models

BenQ Original Lens 5J.JAM37.021 Wide Zoom is an original optical accessory for BenQ business projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.25:1 - 1.79:1. The official compatibility list covers 9 models; before installation, simply verify the projector model and panel size, with no need to make do with an adapter ring. The value of an original lens lies not in the extra rows of numbers on a specification sheet, but in its factory calibration to the optical path and lens mount of that projector series: once installed, the image circle, edge illumination, and focusing travel all operate at their designed values, with no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are based on the original manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please contact us with your projector model for verification. Ordering solely because the model appears similar risks the lens not fitting.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This original zoom lens (1.25:1 - 1.79:1) covers a range of installation distances for any given image size and can focus at any point within that range.

These distances represent the clear distance from the front surface of the lens to the screen and do not include space required for rear cooling and cable connections. They are calculated for a 16:10 image; for actual installation, follow on-site measurements and the original manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness is slightly lower. Where the venue allows, we recommend using the middle of the range. After installation, first find the sharpest position using the focus ring, then fine-tune the lens shift.

3. Compatible Models (9 Models)

The following table is taken from the original manufacturer's compatibility list. Brightness and resolution are populated from the model database; where the data cannot be retrieved, it is marked as —, and no assumptions are made.

To determine whether a model not on the list is compatible, please send us photos of the projector nameplate and the existing lens for verification. Projectors from the same platform generation often share a mount, but it is not worth taking the risk of ordering solely because the model numbers are similar.

Throw Ratios by Model Series

When the same 5J.JAM37.021 Wide Zoom is installed on the series below, its rated throw ratio varies. Select the value corresponding to the series of the actual projector.

4. Check Three Things Before Replacement

• Confirm the projector imaging chip and resolution. The original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot fully cover the image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.25:1 - 1.79:1. Use the table in Section 2 to determine the distances for your installation site. A fixed-focus lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends of the range.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount used on that projector series, and you must hear it lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking, not by a problem with the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the nameplate on the existing lens. Verification against the actual hardware is the most reliable approach.