Ricoh 512959 Short Zoom #B1 Standard Throw Projector Lens: PJ KU12000 Compatible

Ricoh Genuine Lens 512959 Short Zoom #B1 is an original optical accessory for Ricoh engineering projectors, belonging to the standard throw category, with a throw ratio of 0.84-1.02:1. The original compatibility list covers 1 model; before installation, simply verify the body model and panel size — no need to make do with adapter rings. The value of an original lens lies not in a few extra rows of numbers on a spec sheet, but in the fact that it is calibrated at the factory for the optical path and mount of that series: once fitted, the image circle, edge illumination, and focus travel are all at their designed values, so there is no need to compensate for image quality with keystone correction.

I. Lens Specifications

Brand	Ricoh（Ricoh）
Lens Model	512959 Short Zoom #B1
Throw Ratio	0.84-1.02:1
Product Type	Standard Throw
Compatible Models	1 model
Warranty	12 months; non-human damage is covered by our after-sales service, based on the date shown on the shipping document

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please check with us using your body model. Ordering directly based on a similar model carries the risk that the lens will not fit.

II. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of installation distance to image width. This original lens is a zoom lens (0.84-1.02:1), so a given image size corresponds to a range of distances; any position within that range will focus properly.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 1.81 – 2.19 m
120 inches	2.58 m	approx. 2.17 – 2.63 m
150 inches	3.22 m	approx. 2.71 – 3.29 m
200 inches	4.30 m	approx. 3.61 – 4.39 m

The above is the clear distance from the lens front face to the screen, not including space for rear cooling and cable connections. Calculated for a 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

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

III. Compatible Models (1 model)

The table below is taken from the original compatibility list; brightness and resolution are back-filled from the model database, and entries that cannot be retrieved are marked "—" without speculation.

Model	Brightness	Resolution
Ricoh PJ KU12000	—	—

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

Throw Ratios by Model Series

The nominal throw ratio differs from series to series for the same 512959 Short Zoom #B1, so model selection should be based on the series your projector actually belongs to.

Model Series	Throw Ratio
—	0.84-1.02:1

IV. Three Checks Before Replacement

• Confirm the chip and resolution of the projector.Original lenses are designed for a specific panel size; with a different panel specification the image circle cannot cover the full area, resulting in vignetting or edge light loss.
• Calculate the installation distance first.This lens has a nominal throw ratio of 0.84-1.02:1, so use the table in Section II to match your own venue dimensions. A fixed-focus lens offers no margin, and even a zoom lens needs 10–20 cm reserved at both ends.
• Check the mount and locking mechanism.Original lenses are calibrated to the mount of the series they belong to, and you must hear the lock engage once the lens is fitted. A skewed image or soft edges are usually caused by the lens not being fully locked, rather than a fault in the lens itself.

If you are unsure, take one photo of the projector's nameplate and one of the nameplate on the existing lens and send them to us. Verification against the physical items is the most reliable approach.