Optoma BX-CTA16 Short Fixed Lens for ZU1050 ZU1100 ZU1300 ZU660 ZU750 ZU850 ZU860

Optoma Genuine Lens BX-CTA16 Short Fixed is a factory-supplied optical accessory for Optoma engineering projectors. It is an Ultra Short Throw lens with a 0.36:1 throw ratio for a 0.67" DLP (ProScene ZU series) panel. The manufacturer's compatibility list covers 7 models. Before installation, simply verify the projector model and panel size; no adapter ring is needed. The benefit of a genuine lens goes beyond a few extra figures on a specification sheet: its optical path and mount are calibrated for that projector series from the factory. Once installed, the image circle, edge illumination, and focusing travel all meet their design specifications, eliminating the need for keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please contact us with the projector model. Ordering solely based on 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 installation distance to image width. This genuine lens has a fixed focal length (0.36:1), so the installation distance changes linearly with image size, with no adjustment margin. Accurate measurements are essential before installation.

These are clear distances from the front face of the lens to the screen and do not include space for rear housing ventilation or cable connections. Calculated for a 16:10 image; actual distances should be verified on site and according to the manufacturer's manual.

3. Compatible Projector Models (7 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; unavailable values are marked as “—” and have not been guessed.

To verify whether a model outside the list is compatible, send us photos of the projector nameplate and current lens. Projector platforms of the same generation often share the same mount, but the risk of ordering solely based on a similar model name is not worth taking.

Throw Ratio by Projector Series

The rated throw ratio varies by projector series when the same BX-CTA16 Short Fixed lens is used. Select the value that corresponds to the series of the projector in use.

4. Three Checks Before Replacement

• The panel size must match.BX-CTA16 Short Fixed is designed for a 0.67" DLP (ProScene ZU series) panel. Projectors with a different panel size or resolution may have image circle and edge illumination problems even if the lens mount physically fits.
• Calculate the installation distance first.The rated throw ratio of this lens is 0.36:1. Use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens has no adjustment margin; even with a zoom lens, allow 10–20 cm at both ends.
• Verify the mount and locking mechanism.The genuine lens is calibrated to the mount used on this projector series. After installation, you must hear it lock securely into place. A skewed image or soft edges are usually caused by incomplete locking, rather than a problem with the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the current lens nameplate. Physical verification is the most reliable approach.