ROLY M068 Short Zoom Standard-Throw Lens for RL-M85Q and RL-M85U

ROLY OEM Lens M068 Short Zoom is an original optical accessory for ROLY engineering projectors. It features a standard throw ratio of 0.66-0.81:1. The official compatibility list covers 2 projector models; simply verify the projector model and panel size before installation—no adapter ring workaround is needed. The value of an OEM lens lies not in extra specification figures, but in factory calibration to the optical path and mount of the relevant projector series: once installed, the image circle, edge illumination, and focusing travel are all at their design values, eliminating the need to compensate for image quality with keystone correction.

1. Lens Specifications

The above specifications are based on the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount format not shown in the specifications table, please contact us with your projector model; ordering solely on the basis of 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 (0.66-0.81:1), so a given image size corresponds to a range of installation distances, and the lens can focus throughout that range after installation.

The distances above are clear distances from the front of the lens to the screen and do not account for rear housing ventilation or cabling clearance. Calculated for a 16:10 image, actual distances should be confirmed through on-site measurement and in accordance with the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the close end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and brightness is slightly lower. Where the venue allows, use the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the lens shift.

3. Compatible Models (2 Models)

The table below comes from the official compatibility list. Brightness and resolution have been populated from the model database; where data is unavailable, “—” is shown rather than estimated.

To determine whether a model not on the list is compatible, send us photos of the projector nameplate and current lens for verification. Platforms from the same generation often share a 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 M068 Short Zoom differs across the following series; select the value based on the series of your actual projector.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. OEM lenses are designed for a specific panel size. If the panel specifications differ, 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 0.66-0.81:1. Use the table in Section 2 to calculate the distance for your venue; fixed-focus lenses offer no adjustment margin, and even zoom lenses should have 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount of this projector series. After installation, you must hear the lock engage fully; a skewed image or soft edges are usually caused by incomplete locking, not by a problem with the lens itself.

If you are unsure, send us photos of the projector nameplate and lens nameplate for verification. Checking the actual products is the most reliable approach.