Ricoh 512963 Standard Zoom #B5 Long-Throw Lens for PJ KU12000

Ricoh Original Lens 512963 Standard Zoom #B5 is an original optical accessory for Ricoh engineering projectors. It is a long-throw lens with a throw ratio of 2.00-4.00:1. The manufacturer’s compatibility list covers 1 model. Before installation, simply verify the projector model and panel size—no adapter ring is needed. The value of an original lens lies not in a few additional specifications, but in its factory calibration for the optical path and mount of that model series. Once installed, the image circle, edge illumination, and focus travel all operate at their designed values, with no need to use keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Ricoh (Ricoh)
Lens Model	512963 Standard Zoom #B5
Throw Ratio	2.00-4.00:1
Product Type	Long Throw
Compatible Models	1 unit
Warranty	12 months; after-sales service is available for damage not caused by the user, based on the date on the shipping invoice

The above specifications are subject to the manufacturer’s official specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please provide your projector model so we can verify the details. Ordering 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 original lens is a zoom lens (2.00-4.00:1), so each image size corresponds to a range of installation distances. The lens can focus at any position within that range.

Screen Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 4.30 – 8.60 m
120 inches	2.58 m	Approx. 5.16 – 10.32 m
150 inches	3.22 m	Approx. 6.45 – 12.90 m
200 inches	4.30 m	Approx. 8.60 – 17.20 m

These distances represent the clear distance from the front of the lens to the screen and do not include space behind the projector for cooling and cable connections. The figures are calculated for a 16:10 aspect ratio. Actual conditions should be confirmed through on-site measurements and the manufacturer’s manual.

Image quality varies between the two ends of the zoom range: images are brighter with slightly softer edges toward the short end, while edges appear sharper with slightly lower brightness toward the long end. Where the installation environment allows, use the middle of the range. After installation, first find the sharpest position using the focus ring, and then fine-tune the lens shift.

III. Compatible Models (1 unit)

The table below is taken from the manufacturer’s compatibility list. Brightness and resolution values are sourced from the model database. Unavailable values are shown as “—” and have not been estimated.

Model	Brightness	Resolution
Ricoh PJ KU12000	—	—

To check whether a model outside this list is compatible, send us a photo of the projector nameplate and the existing lens. Models from the same generation often share the same mount, but ordering based on a similar model is not worth the risk.

Throw Ratios by Model Series

The nominal throw ratio of the same 512963 Standard Zoom #B5 varies by model series. When selecting a lens, use the value for the actual projector series.

Model Series	Throw Ratio
—	2.00-4.00:1

IV. Three Checks Before Replacement

• Confirm the projector panel and resolution. Each original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full panel, resulting in vignetting or edge light loss.
• Calculate the installation distance first. This lens has a nominal throw ratio of 2.00-4.00:1. Use the table in Section II to calculate the distance for your installation environment. A fixed-focus lens offers no adjustment margin, and even a zoom lens should have 10–20 cm of clearance at both ends of the range.
• Verify the mount and locking mechanism. The original lens is calibrated for the mount of that model series. You must hear it click into the locked position after installation. A skewed image and soft edges are usually caused by the lens not being fully locked, rather than a problem with the lens itself.

If you are unsure, take one photo of the projector nameplate and one photo of the existing lens nameplate and send them to us. Verification against the actual hardware is the most reliable approach.