BenQ LS2SD2 Standard Zoom Lens Analysis: LU9235 and PX9230 Compatibility

BenQ Genuine Lens LS2SD2 Standard Zoom is a factory-supplied optical accessory for BenQ business projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.54:1 - 1.93:1. The official compatibility list covers 2 models. Before installation, simply verify the projector model and panel size; there is no need to improvise with adapter rings. The value of a genuine lens lies not in the extra rows of figures in the specification sheet, but in the fact that it is calibrated at the factory to the optical path and lens mount of the relevant model series. Once installed, image circle coverage, edge illumination, and focusing travel all meet the design values, so there is no need to compensate for image quality with keystone correction.

I. Lens Specifications

The above specifications are based on the manufacturer's official specifications. Mechanical dimensions, flange distance, and mount type not shown in the specification table should be verified with us according to the projector model. Ordering solely because the model appears similar carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This genuine lens is a zoom lens (1.54:1 - 1.93:1), so each image size corresponds to a range of installation distances, and the lens can focus at any point within that range.

These figures represent the clear distance from the front surface of the lens to the screen and do not include rear clearance for ventilation or cable connections. They are calculated for a 16:10 image; actual values should be confirmed through on-site measurements and the 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 decreases slightly. Where installation space permits, the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, and then fine-tune the lens shift.

III. Compatible Models (2 Models)

The following table is taken from the official compatibility list. Brightness and resolution values are listed according to the model database; unavailable values are marked — and have not been estimated.

To determine whether a model outside the list is compatible, send us a photo of the projector nameplate and your current lens for verification. Platforms from the same generation often share the same mount, but ordering solely because the model numbers look similar is not worth the risk.

Throw Ratios for Different Model Series

Although the same LS2SD2 Standard Zoom is used with the series listed below, the specified throw ratios are different. When selecting a lens, use the value for the series of the actual projector.

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution. A genuine 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 light loss at the edges.
• Calculate the installation distance first. The rated throw ratio of this lens is 1.54:1 - 1.93:1. Use the table in Section 2 to match the dimensions of your venue. A fixed-focus lens provides no adjustment margin, and even a zoom lens should allow 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. Genuine lenses are calibrated to the mount of the relevant projector series. You must hear the lens lock fully into place after installation. A skewed image or soft edges are usually caused by incomplete locking, rather than by the lens itself.

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