Ricoh 308934 Standard Zoom #1 Telephoto Lens for PJ WU6181N, PJ WX6181N & PJ X6180N

Ricoh Original Lens 308934 Standard Zoom #1 is an original optical accessory for Ricoh professional projectors. It is a long-throw lens with a throw ratio of 1.50-3.00:1. The factory compatibility list covers 3 models. Before installation, verify the projector model and panel size; there is no need to make do with adapter rings. The value of an original lens lies not in the extra 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 focusing travel all operate at their design values, eliminating the need to compensate for image quality with keystone correction.

I. Lens Specifications

Brand	Ricoh (Ricoh)
Lens Model	308934 Standard Zoom #1
Throw Ratio	1.50-3.00:1
Product Type	Long Throw
Compatible Models	3 models
Warranty	12 months; damage not caused by the user is eligible for after-sales service, based on the date shown on the shipping invoice

The above specifications are subject to the original manufacturer’s specifications. Mechanical dimensions, flange distance, and mount type are not shown in the specifications table. Please verify them against the projector model with our team before ordering. Placing an order solely because the models appear similar may result in the lens not fitting.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This original lens is a zoom lens (1.50-3.00:1), so a given image size corresponds to a range of installation distances. It can focus at any distance within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 3.22 – 6.45 m
120 inches	2.58 m	approx. 3.87 – 7.74 m
150 inches	3.22 m	approx. 4.84 – 9.67 m
200 inches	4.30 m	approx. 6.45 – 12.90 m

These figures represent the clear distance from the front of the lens to the screen and do not allow for space behind the projector for ventilation and cable connections. They are calculated for a 16:10 image; actual installation should be verified on site and in accordance with 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 the venue allows, use the middle of the range. After installation, first find the sharpest position on the focus ring, then fine-tune the lens shift.

III. Compatible Models (3 Models)

The table below is taken from the manufacturer’s compatibility list. Brightness and resolution are populated from the model database; fields that cannot be retrieved are shown as “—”, with no assumptions made.

Model	Brightness	Resolution
Ricoh PJ WU6181N	—	—
Ricoh PJ WX6181N	—	—
Ricoh PJ X6180N	—	—

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

Throw Ratio by Projector Series

The rated throw ratio of the same 308934 Standard Zoom #1 varies by the series listed below. Select the value based on the series of the projector in use.

Projector Series	Throw Ratio
—	1.50-3.00:1

IV. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. Original lenses are designed for a specific panel size. If the panel specifications differ, the image circle will not cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.50-3.00:1. Use the table in Section II to match the dimensions of your venue. Fixed-focus lenses provide no adjustment margin, and zoom lenses also require 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that projector series, and you must hear it click into the locked position after installation. A skewed image or soft edges are usually caused by incomplete locking, not a fault in the lens itself.

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