WK151 Projector Lens 0.46:1 for 10 Panasonic Models incl. PT-FRQ680C, FRQ580C, FRQ50, FRQ60, FRZ580C

WK151 is a short-throw lens for the 0.65/0.66/0.67 panel family (Panasonic), with a 0.46:1 throw ratio and lens shift. It is compatible with 10 projector models across 1 model series. This guide lays out the lens specifications, installation distance, model compatibility list, and replacement considerations all in one place.

I. Lens Specifications

Lens shift is the key differentiator of this lens. With a shift range of 85.2% horizontally and 39.6% vertically, the projector can be installed off the screen’s center axis, and lens shift can bring the image back into position without keystone correction. Keystone correction has a cost—each correction step sacrifices some effective pixels and can blur text edges. In professional installations, never use keystone correction when lens shift can solve the problem; image quality is the bottom line.

II. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This lens has a fixed focal length (0.46:1), so the installation distance changes linearly with image size and offers no adjustment margin. Measurements must be accurate before installation.

The values above represent the clear distance from the lens front to the screen and do not include space behind the projector for cooling and cable connections. They are calculated for a 16:10 image; actual values should be verified on site and against the manual.

III. Compatible Projector Models (10 Models, Panasonic)

The table below is arranged from newest to oldest by model production date and includes each model’s resolution, brightness, and factory-standard lens zoom ratio, making it easy to identify the right option for each project.

The zoom ratio is the zoom factor of the factory-standard lens for the model (the upper limit ÷ the 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 factory-standard lenses for these 10 models generally have throw ratios clustered in the 1.5–2.9:1 range. The 0.46:1 ratio of the model featured here effectively represents a modified focal length, allowing the same projection distance to produce a different image size—this is the direct reason for replacing the lens. Full lens-shift capability is retained, so the image can still be aligned after the focal-length adjustment.

IV. Three Checks Before Replacement

• Make sure the panel and resolution match. This model is designed for a 0.67 inch panel. Projectors with a different panel size or resolution may have slightly different projection performance, so the safest approach is to check the projector nameplate before installation.
• Check the interface and locking mechanism. Interfaces are generally compatible within the same platform generation, but the locking-tab position differs between generations. If the image appears skewed or the edges look soft after installation, this is usually because the lock is not fully engaged, not because of a fault in the lens itself.
• Factor the lens-shift margin into the installation. The shift range provides installation leeway, but edge image quality declines when it is pushed to the limit. For actual use, keep operation within 70% of the nominal value.

To confirm whether a model outside the list can be used, send us photos of the projector nameplate and the original lens—platforms of the same generation often share interfaces, but the risk of ordering solely based on a similar model designation is not worth taking.