BenQ 5J.JDH37.031 Semi Long Zoom Standard Throw Lens Guide for HT6050 PU9220 PU9220+ PX9210

BenQ Original Lens 5J.JDH37.031 Semi Long Zoom is an original optical accessory for BenQ business projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.93:1 - 2.90:1. The factory compatibility list covers 4 models; before installation, simply verify the projector model and panel size—there is no need to improvise with adapter rings. The value of an original lens lies not in a few extra specification figures, but in the fact that it is factory-calibrated to the optical path and mount of that model series. Once installed, the image circle, edge illumination, and focusing travel all meet their design values, so there is no need to use 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 distance, and mount type not shown in the specification table, please contact us to verify them based on the projector model. Ordering based solely on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This original zoom lens (1.93:1 - 2.90:1) corresponds to a range of distances for a given image size and can focus anywhere within that range during installation.

The distances above are clear distances from the front of the lens to the projection screen and do not include space for rear projector cooling and cable connections. They are calculated for a 16:10 image; actual distances should be verified on site and are subject to the original manufacturer's manual.

Image quality varies at the two ends of the zoom range: near the short-throw end, the image is brighter and the edges are slightly softer; near the long-throw end, the edges are sharper and the image is slightly dimmer. Where site conditions allow, use the middle of the range. After installation, first find the sharpest position on the focus ring, then fine-tune the lens shift.

3. Compatible Models (4 Models)

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

To check whether a model not on the list is compatible, please send us photos of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but placing an order based solely on a similar model name is not worth the risk.

Throw Ratios by Model Series

The specified throw ratio varies by model series when the same 5J.JDH37.031 Semi Long Zoom lens is used. Select the value based on the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution. The 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 after installation.
• Calculate the installation distance first. This lens has a specified throw ratio of 1.93:1 - 2.90:1. Use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens provides no adjustment margin, and even with a zoom lens, allow an additional 10–20 cm at each end of the range.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that model series. After installation, you must hear it click into the locked position. If the image is skewed or the edges are soft, the most likely cause is incomplete locking rather than a problem with the lens itself.

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