Ricoh 512962 Standard Zoom #B4 Standard-Throw Lens for PJ KU12000

Ricoh Original Lens 512962 Standard Zoom #B4 is an OEM optical accessory for Ricoh engineering projectors, offering a standard throw (Standard Throw) with a throw ratio of 1.50-2.00:1. The factory compatibility list covers 1 model; simply verify the body model and panel size before installation—no adapter ring workaround is needed. The value of an OEM lens lies not in a few extra rows in the spec sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that series: once installed, the image circle, edge uniformity, and focus travel are all at their designed values, so there is no need to rely on keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Ricoh（Ricoh）
Lens Model	512962 Standard Zoom #B4
Throw Ratio	1.50-2.00:1
Product Type	Standard Throw
Compatible Models	1 unit
Warranty	12 months; for non-human damage, after-sales service applies, based on the date on the shipping document

The above specifications are subject to the original manufacturer specifications. Mechanical dimensions, flange distance, and mount type are not listed in the specification table; please verify them with us using your body model, since ordering based on a similar model number carries the risk that the lens will not fit.

2. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.50-2.00:1), so a single image size corresponds to a range of distances, and any position within that range can be brought into focus during installation.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 3.22 – 4.30 m
120 inches	2.58 m	approx. 3.87 – 5.16 m
150 inches	3.22 m	approx. 4.84 – 6.45 m
200 inches	4.30 m	approx. 6.45 – 8.60 m

These figures represent the clear distance from the front of the lens to the screen, excluding space for rear cooling and cabling on the projector body. Calculated for a 16:10 aspect ratio; in practice, on-site measurement and the original manufacturer's manual take precedence.

Image quality differs at the two ends of the zoom range: near the short-throw end the image is brighter with slightly softer edges; near the long-throw end the edges are crisper and brightness drops slightly. Where the venue allows, it is recommended to position the lens in the middle of the range, and after installation, first find the sharpest position on the focus ring, then fine-tune the lens shift.

3. Compatible Models (1 unit)

The table below is taken from the factory compatibility list; brightness and resolution are filled in from the model database. Values that cannot be retrieved are shown as "—", with no speculation.

Model	Brightness	Resolution
Ricoh PJ KU12000	—	—

For models outside this list, please send us a photo of the nameplate on the projector body and the existing lens for verification—platforms of the same generation often share the same mount, but the risk of ordering based on a similar model number is not worth taking.

Throw Ratios Across Model Series

The same 512962 Standard Zoom #B4 installed on the following series does not have the same rated throw ratio, so selection must be based on the series of the actual projector in use.

Model Series	Throw Ratio
—	1.50-2.00:1

4. Three Checks Before Replacement

• Confirm the projector chip and resolution.OEM lenses are designed for a specific panel size; if the panel specification differs, the image circle cannot cover the full frame, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first.This lens has a rated throw ratio of 1.50-2.00:1; apply the table in Section 2 to your own venue dimensions. A fixed-focus lens leaves no margin, and even with a zoom lens, allow an extra 10–20 cm at both ends.
• Verify the mount and locking mechanism.The OEM lens is calibrated to the mount of that model series, and you must hear the lock engage after installation; a skewed image or soft edges are usually caused by an incompletely locked mount, not by the lens itself.

If you are unsure, take one photo of the projector nameplate and one of the nameplate on your existing lens and send them to us—verification against the actual items is the safest approach.