WB410 Projector Lens 0.74–0.77:1 for ViewSonic SML-L1300U, L1700U & LD1500U

WB410 is a short-throw lens for the 0.65/0.66/0.67 panel group (SML), with a throw ratio of 0.74–0.77:1 and lens shift. It is compatible with 3 projector models from 1 model series. This article consolidates the lens specifications, installation distances, model compatibility list, and replacement considerations.

1. Lens Specifications

Lens shift is the key differentiator of this lens. A shift range of 70.30% horizontally and 32% vertically allows the projector to be installed off the screen centerline, with lens shift used to reposition the image without requiring keystone correction. Keystone correction comes at a cost—each adjustment step reduces the number of usable pixels, causing text edges to become blurred. In professional installations, use lens shift instead of keystone correction whenever possible; this is the baseline for maintaining image quality.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the installation distance divided by the image width. This lens supports zoom (0.74–0.77:1), so each image size corresponds to a range of distances; it can focus at any distance within that range during installation.

These values represent the clear distance from the front of the lens to the screen and do not include clearance behind the chassis for heat dissipation or cable connections. They are calculated for a 16:10 image; actual values should be verified on site and against the manual.

Image quality varies at the two ends of the zoom range: toward the short end, the image is brighter and the edges are slightly softer; toward the long end, the edges are sharper and brightness is slightly lower. Where installation 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—adjusting both at once makes it difficult to achieve optimum accuracy.

3. Compatible Models (3 Models, SML)

The following table is ordered by model production date, from newest to oldest, and lists the resolution, brightness, and zoom ratio of each model's original standard lens for quick reference based on project requirements.

The zoom ratio is the zoom factor of the model's original standard lens (upper limit ÷ lower limit of its original throw-ratio range), not the zoom range of the lens featured in this article.

Common Features of These Models

The throw ratios of the original standard lenses for these 3 models are generally in the 1.5-2.4:1 range. The 0.74–0.77:1 ratio of the model in this article effectively changes the focal range, allowing different image sizes at the same projection distance—this is the direct reason for replacing the lens. It also preserves full lens-shift capability, allowing the image to remain aligned after the focal range is adjusted.

4. Three Checks Before Replacement

• The panel and resolution must match. This model is designed for 0.67-inch panels. Projectors with different panel sizes or resolutions may show slightly different projection performance, so checking the nameplate on the projector before installation is the safest approach.
• Interfaces and locking mechanism. Interfaces are generally shared within the same platform generation, but the locking clip positions differ between generations. If the image is skewed or the edges are soft after installation, the cause is usually an incompletely engaged lock, not the lens itself.
• Allow for lens-shift margin in the installation. The shift range provides installation flexibility, but image quality at the edges declines at the extremes; in practice, keep usage within 70% of the rated values.

For the safest verification of compatibility with models not listed, send us the projector nameplate and a photo of the original lens. Platforms of the same generation often share interfaces, but ordering based solely on similar model names carries unnecessary risk.