Ricoh 512964 Long Zoom #B6 Projector Lens for PJ KU12000

Ricoh Original Lens 512964 Long Zoom #B6 is an OEM optical accessory for Ricoh engineering projectors. It is a Long Throw lens with a throw ratio of 4.00-7.20:1. The official compatibility list covers 1 model. Before installation, simply verify the projector model and panel size; no adapter ring workaround is needed. The value of an OEM lens lies not in additional specification figures, but in its factory calibration to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focusing travel are all at their design values, with 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 shown in the specification table. Please verify them with us based on the projector model; ordering directly based on a similar model carries the risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (4.00-7.20:1), so a given image size corresponds to a range of distances, and the lens can focus anywhere within that range during installation.

These values represent the clear distance from the front face of the lens to the screen and do not account for space behind the projector for heat dissipation and cable connections. They are calculated for a 16:10 image; in practice, on-site measurements and the manufacturer's manual take precedence.

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

3. Compatible Models (1 model)

The table below is taken from the official compatibility list. Brightness and resolution are filled in from the model database; unavailable values are shown as — and are not estimated.

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

Throw Ratios by Model Series

The nominal throw ratio differs by series when the same 512964 Long Zoom #B6 is installed on the following series, so use the value for the projector's actual series when selecting a lens.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. The OEM lens is designed for a specific panel size. With different panel specifications, the image circle cannot provide full coverage, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 4.00-7.20:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens offers no adjustment margin, and even a zoom lens should allow 10–20 cm of extra space at both ends.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount of that projector series. After installation, you must hear the lens lock securely into place. An offset image or soft edges are usually caused by incomplete locking, not by a problem with the lens itself.

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