Ricoh 512961 Wide Zoom #B3 Standard Throw Projector Lens: Compatible with PJ KU12000

Ricoh Original Lens 512961 Wide Zoom #B3 is a genuine optical accessory for Ricoh installation projectors, belonging to the standard throw category, with a throw ratio of 1.20-1.50:1. The original compatibility list covers 1 projector model; before installation, simply verify against the projector model and panel size—no need to rely on adapter rings. The value of an original lens isn't in having a few more numbers on the spec sheet, but in being calibrated at the factory to the optical path and lens mount of that projector series: once installed, the image circle, edge illumination, and focus travel are all at their design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and lens mount type not shown in the spec table, please verify with us against the projector model; ordering based solely on model similarity carries the risk of incompatibility.

2. Throw Ratio Conversion to Installation Distance

The throw ratio is the ratio of installation distance to screen width. This original lens is a zoom lens (1.20-1.50:1), so the same screen size corresponds to a range of distances; as long as installation falls within this range, focus can be achieved.

The above figures are the clear distance from the lens front to the screen, excluding rear ventilation and cabling space behind the projector body. Calculated based on 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: toward the near end, the image is brighter with slightly softer edges; toward the far end, edges are sharper with slightly reduced brightness. Where space permits, it is recommended to land in the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the shift.

3. Compatible Models (1 unit)

The table below is taken from the original compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable, without speculation.

To determine whether models outside the list can be used, please send us a photo of the projector nameplate and the existing lens for verification—same-generation platforms often share lens mounts, but ordering based on model similarity is not worth the risk.

Throw Ratios Across Different Model Series

The same 512961 Wide Zoom #B3 installed on the following series has different nominal throw ratios; selection should be based on the actual series of the projector body.

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for specific panel sizes; if the panel specifications differ, the image circle cannot cover it, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 1.20-1.50:1; apply it to your venue dimensions using the table in Section 2. Fixed-focus lenses have no margin, and even for zoom lenses, leave 10–20 cm at both ends.
• Verify the lens mount and locking. Original lenses are calibrated to the lens mount of that projector series; after installation, you must hear the lock click into place. Image skew and soft edges are mostly due to incomplete locking, not a problem with the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us; verification against the actual hardware is the most reliable approach.