Ricoh 308936 Zoom #2 Standard Throw Lens for PJ WU6181N, PJ WX6181N, PJ X6180N

Ricoh Original Lens 308936 Zoom #2 is an OEM optical accessory for Ricoh professional projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.19-1.56:1. The OEM compatibility list covers 3 models; before installation, simply verify the projector model and panel size, with no need to improvise using adapter rings. The value of an OEM lens lies not in the extra figures in its specification table, but in the fact that it is factory-calibrated to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focusing travel all match the design values, so there is no need to compensate for image quality with keystone correction.

1. Lens Specifications

Brand	Ricoh（Ricoh）
Lens Model	308936 Zoom #2
Throw Ratio	1.19-1.56:1
Product Type	Standard throw (Standard Throw)
Compatible Models	3 units
Warranty	12 months; if the damage is not user-caused, after-sales service is available, based on the date on the shipping receipt

The above specifications are subject to the original manufacturer’s specifications. Mechanical dimensions, flange distance, and mount type not listed in the specifications table should be checked with us against the projector model. Ordering based solely on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio to Installation Distance

A throw ratio is the ratio of installation distance to image width. This OEM lens is a zoom lens (1.19-1.56:1), so a given image size corresponds to a range of distances, and any position within that range can be focused.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 2.56 – 3.35 m
120 inches	2.58 m	Approx. 3.07 – 4.02 m
150 inches	3.22 m	Approx. 3.84 – 5.03 m
200 inches	4.30 m	Approx. 5.12 – 6.71 m

The figures above represent the clear distance from the front surface of the lens to the screen and do not include space at the rear of the projector for cooling and cable connections. Values are calculated for a 16:10 image; actual values should be verified through on-site measurements and against the manufacturer’s manual.

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

3. Compatible Models (3 Units)

The following table is taken from the OEM compatibility list. Brightness and resolution are populated from the model database; where the data is unavailable, “—” is shown and no assumptions are made.

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

For compatibility with a model not on the list, send us photos of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but ordering based on a similar model is not worth the risk.

Throw Ratios by Projector Series

The nominal throw ratio varies by series when the same 308936 Zoom #2 is used, so select the value for the series of the projector in question.

Model Series	Throw Ratio
—	1.19-1.56:1

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. The OEM lens is designed for a specific panel size. If the panel specifications differ, it cannot cover the full image circle, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a nominal throw ratio of 1.19-1.56:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens offers no adjustment margin, while a zoom lens should also allow 10–20 cm of margin at both ends.
• Check the mount and locking mechanism. The OEM lens is calibrated to the mount of that projector series, and you must hear it lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking rather than a problem with the lens itself.

If you are unsure, photograph the projector nameplate and the nameplate on the current lens and send the images to us. Verification against the actual hardware is the safest approach.