Barco EN57 Ultra Short Fixed Lens Analysis: CTPN-41B & CTWQ-51B Compatible

Barco Original Lens EN57 Ultra Short Fixed is an original optical accessory for Barco professional projectors. It is an ultra short throw (Ultra Short Throw) lens with a throw ratio of 0.30:1. The official compatibility list covers 2 models; before installation, simply verify the projector model and panel size without resorting to adapter rings. The value of an original lens lies not in a few extra rows of specifications, but in the fact that it is calibrated at the factory to the optical path and mount of that model series: once installed, the image circle, edge illumination, and focusing travel all meet their design values, with no need to use 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 distance, and mount type not shown in the specifications table, please verify them with us using the projector model. Ordering based solely on a similar model carries the risk that the lens will not fit.

2. Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This original fixed-focus lens has a throw ratio of 0.30:1, so the installation distance varies linearly with image size, with no adjustment margin. Accurate measurements are essential before installation.

These figures represent the clear distance from the front surface of the lens to the screen, excluding the space behind the projector for ventilation and cabling. They are calculated for a 16:10 image; actual distances should be verified through on-site measurements and in accordance with the manufacturer's manual.

3. Compatible Models (2 models)

The table below is taken from the official compatibility list. Brightness and resolution are based on the model database; where the data is unavailable, “—” is shown, with no assumptions made.

For models not on the list, please send us photos of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but the risk of ordering based solely on a similar model is not worth taking.

Throw Ratio by Model Series

The nominal throw ratio varies by model series when the same EN57 Ultra Short Fixed lens is installed. Use the value corresponding to the series of the actual projector when selecting a lens.

4. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution.Original lenses are designed for a specific panel size. With different panel specifications, the image circle cannot cover the image, resulting in dark corners or edge light loss.
• Calculate the installation distance first.This lens has a rated throw ratio of 0.30:1; apply the table in Section 2 to the dimensions of your installation site. A fixed-focus lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism.The original lens is calibrated to the mount of that model series, and you must hear it lock into place after installation. Image skew and blurred edges are usually caused by incomplete locking, not by a problem with the lens itself.

If you are unsure, take one photo of the projector nameplate and one of the current lens nameplate, then send them to us. Verification against the actual hardware is the most reliable approach.