Ricoh 512917 Long Zoom #A4 Lens for PJ WUL6280 PJ WXL6280

Ricoh Genuine Lens 512917 Long Zoom #A4 is an OEM optical accessory for Ricoh engineering projectors. It is a long-throw lens (Long Throw) with a throw ratio of 1.52-2.92:1. The manufacturer’s compatibility list covers 2 models. Before installation, simply verify the projector model and panel size; there is no need to improvise with adapter rings. The value of an OEM lens lies not in the additional figures in its specification sheet, 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 are all at their designed values, so keystone correction is unnecessary to compensate for image quality.

I. Lens Specifications

The above specifications are subject to the manufacturer’s specifications. Mechanical dimensions, flange distance, and mount type are not listed in the specification table; please verify them with us based on the projector model. Placing an order based solely on a similar model carries the risk that the lens will not fit.

II. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.52-2.92:1), so a given image size corresponds to a range of installation distances. Focus can be achieved anywhere within that range.

These figures represent the clear distance from the front of the lens to the screen and do not account for rear housing ventilation or cable-routing space. They are calculated for a 16:10 image; actual values should be confirmed through on-site measurement and against the manufacturer’s manual.

Image quality differs at the two ends of the zoom range: at the near end, the image is brighter and the edges are slightly softer; at the far end, the edges are sharper and brightness is slightly lower. Where the venue allows, the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

III. Compatible Models (2 Models)

The following table is taken from the manufacturer’s compatibility list. Brightness and resolution are listed according to the model database; unavailable values are shown as — and have not been estimated.

To determine whether a model outside the list can be used, send us a photo of the projector nameplate and the current lens for verification. Projectors from the same generation often share the same mount, but ordering based solely on a similar model is not worth the risk.

Throw Ratio by Model Series

The nominal throw ratio varies by series when the same 512917 Long Zoom #A4 is installed. Select the value based on the series of the projector in use.

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution.OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first.The nominal throw ratio of this lens is 1.52-2.92:1. Use the table in Section II to match the dimensions of your venue. A fixed-focus lens offers no adjustment margin, and a zoom lens should also allow a 10–20 cm margin at both ends of the range.
• Verify 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. Image skew or soft edges are usually caused by an incompletely engaged lock, 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 items is the most reliable approach.