Ricoh 512918 Long Zoom #A5 Lens Guide: PJ WUL6280 and PJ WXL6280

Genuine Ricoh Lens 512918 Long Zoom #A5 is an original optical accessory for Ricoh engineering projectors. It is a Long Throw lens with a 2.90-5.50:1 throw ratio. The manufacturer's compatibility list covers 2 projector models. Before installation, simply verify the projector model and panel size; there is no need to improvise with an adapter ring. The value of an original lens lies not in the additional specifications, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focus 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 manufacturer's specifications. Mechanical dimensions, flange distance, and mount type are not listed in the specifications. Please contact us with the projector model so we can verify these details; ordering based solely on a similar model carries the risk that the lens will not fit.

2. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine lens is a zoom lens (2.90-5.50:1), so each image size corresponds to a range of installation distances. The lens can be focused at any distance within that range.

The distances shown are clear distances from the front surface of the lens to the screen and do not allow for rear cooling space or cable connections. Calculations are based on a 16:10 image; actual distances should be verified on site and in accordance with the manufacturer's manual.

Image quality varies at the two ends of the zoom range: the close end produces a brighter image with slightly softer edges, while the long end produces sharper edges with slightly lower brightness. Where venue conditions allow, we recommend positioning the lens near the middle of the range. After installation, find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Projector Models (2 Models)

The table below is based on the manufacturer's compatibility list. Brightness and resolution are taken from the projector model database. Where the data is unavailable, “—” is shown rather than estimated.

To determine whether a model outside the list is compatible, send us photos of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but ordering based solely on model similarity is not worth the risk.

Throw Ratio by Projector Series

Although the same 512918 Long Zoom #A5 lens is used with the series listed below, the rated throw ratio is not the same in every case. Use the value for the series of the projector in question when selecting a lens.

4. Three Checks Before Replacement

• Confirm the projector imaging panel and resolution. Original lenses are engineered for a specific panel size. If the panel specifications differ, the image circle cannot cover the panel, resulting in vignetting or edge light loss.
• Calculate the installation distance first. Apply the rated 2.90-5.50:1 throw ratio to your venue dimensions using the table in Section 2. A fixed-focus lens provides no adjustment margin; even with a zoom lens, allow 10–20 cm at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount for that projector series. You must hear it click into the locked position after installation. A skewed image or soft edges are usually caused by incomplete locking, not by a fault in the lens itself.

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