Ricoh 308937 Zoom #3 Long-Throw Projector Lens for PJ WU6181N, PJ WX6181N and PJ X6180N

Genuine Ricoh Lens 308937 Zoom #3 is an OEM optical accessory for professional Ricoh projectors, featuring a long-throw design with a throw ratio of 2.97-4.79:1. The official compatibility list covers 3 models. Before installation, simply verify the projector model and panel size; no adapter ring is needed. The value of an OEM lens lies not in the extra figures on a specification sheet, but in its factory calibration to the optical path and lens 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.

1. Lens Specifications

Brand	Ricoh (Ricoh)
Lens Model	308937 Zoom #3
Throw Ratio	2.97-4.79:1
Product Type	Long Throw
Compatible Models	3 models
Warranty	12 months; damage not caused by improper use is eligible for after-sales service, based on the date shown on the shipping documents

These specifications are subject to the official OEM specifications. Mechanical dimensions, flange distance, and mount type are not listed; contact us with your projector model to verify them. Ordering based solely on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (2.97-4.79:1), so each image size corresponds to a range of installation distances. The lens can focus at any distance within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 6.39 – 10.30 m
120 inches	2.58 m	Approx. 7.66 – 12.36 m
150 inches	3.22 m	Approx. 9.58 – 15.45 m
200 inches	4.30 m	Approx. 12.77 – 20.60 m

The distances above are clear distances from the front of the lens to the screen and do not include space behind the projector for cooling and cable connections. They are calculated for a 16:10 image; confirm the actual distance through on-site measurements and the OEM manual.

Image quality differs at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and brightness decreases slightly. Where the venue allows, we recommend using the middle of the range. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

3. Compatible Models (3 Models)

The following table is taken from the official compatibility list. Brightness and resolution are populated from the model database; values that cannot be retrieved are shown as “—”, with no assumptions made.

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

For a model not on the list, send us photos of the projector nameplate and the current lens so we can verify compatibility. Projectors from the same generation often share a lens mount, but the risk of ordering based on a similar model is not worth taking.

Throw Ratio by Projector Series

The same 308937 Zoom #3 lens has different nominal throw ratios when used with the series listed below. Select the value for the series of your actual projector.

Projector Series	Throw Ratio
—	2.97-4.79:1

4. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution. The OEM lens is designed for a specific panel size. If the panel size differs, the image circle cannot cover it fully, causing vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.97-4.79:1. Use the table in Section 2 to calculate the distance for your venue. A fixed lens offers no adjustment margin, while a zoom lens requires 10–20 cm of clearance at both ends of the range.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the lens mount of that projector series. After installation, you must hear it click into the locked position. A skewed image or soft edges usually indicate that the lens is not fully locked, rather than a problem with the lens itself.

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