LC01B Projector Lens 1.5–3:1 for 3 Commercial Models Such as Sharp XP-P601Q-W, P721Q-B

The LC01B is a medium-to-long-throw lens for 0.65/0.66/0.67 panel groups (Sharp, ViewSonic), with a 1.5–3:1 throw ratio and lens shift. It is compatible with 3 projector models from 2 model series. This article presents the lens specifications, installation distances, model compatibility list, and replacement considerations in one place.

1. Lens Specifications

Lens-shift capability is the key differentiator of this lens. The horizontal +64 %, -44 % and vertical +34 %, -27 % shift ranges allow the projector to be installed off the screen’s central axis, with lens shift repositioning the image without requiring keystone correction. Keystone correction comes at a cost—each adjustment reduces the number of effective pixels and slightly softens text edges. In professional installations, always use lens shift rather than keystone correction whenever possible; this is the baseline for image quality.

2. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of installation distance to image width. This is a zoom lens (1.5–3:1), so each image size corresponds to a range of installation distances, and the image can be focused at any position within that range during installation.

These distances represent the clear distance from the front element of the lens to the screen and do not include space for rear housing ventilation or cable connections. They are calculated for a 16:10 image format; actual distances should be verified by on-site measurement and in accordance with the manual.

Image quality varies 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, positioning near the middle of the range is recommended. After installation, first find the sharpest position on the focus ring, then fine-tune the lens shift—adjusting both variables at once makes precise alignment difficult.

3. Compatible Models (Sharp, ViewSonic)

The table below is ordered from newest to oldest by model launch date and lists each model’s resolution, brightness, and factory-lens zoom ratio, enabling quick selection according to project requirements.

The zoom ratio is the zoom factor of the model’s factory-standard lens (upper limit ÷ lower limit of the standard throw-ratio range), not the zoom range of the lens discussed in this article.

Common Features of These Models

The factory-standard lenses for all 3 models generally have throw ratios within 1.25-2.0：1. The 1.5–3:1 range of the model discussed here effectively adjusts the focal range, allowing different image sizes from the same projection distance—this is the direct reason for replacing the lens. It also retains full lens-shift capability, so the image can still be realigned after the focal range is adjusted.

4. Three Checks Before Replacement

• Panel and resolution must match. This model is compatible with 0.67 inches. Projectors with a different panel size or resolution will differ somewhat in projection performance; checking against the nameplate on the chassis before installation is the safest approach.
• Interfaces and locking mechanism. Models on the same-generation platform generally offer good interface compatibility, but the position of the locking catch varies between generations. If the image appears skewed or the edges are not sharp after installation, the lock is usually not fully engaged; this is typically not an issue with the lens itself.
• Factor the lens-shift margin into the installation. The shift ranges leave some installation margin, but edge image quality declines when the lens is pushed to its limits. In practice, actual use should be kept within 70% of the rated values.

For models not included in the list, the safest option is to send us photos of the chassis nameplate and original lens for verification. Same-generation platforms often share interfaces, but ordering based only on a similar model designation is not worth the risk.