Sharp XP-51ZL Short Zoom Lens Guide: Fits XP-A155U-B XP-A155U-W XP-A175U-B XP-A175U-W XP-A201U-B

Sharp Genuine Lens XP-51ZL Short Zoom is an OEM optical accessory for Sharp engineering projectors. It is a short-throw (Short Throw) lens with a throw ratio of 0.53-0.65:1. The OEM compatibility list covers 5 models; simply verify the projector model and panel size before installation, with no need for adapter rings. The value of an OEM lens lies not in the additional figures in a specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focus 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 subject to the OEM specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please provide your projector model so we can verify them. Ordering solely based on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (0.53-0.65:1), so a given image size corresponds to a range of distances. It can focus at any position within that range during installation.

These figures represent the clear distance from the front of the lens to the screen and do not include space for rear projector ventilation or cable connections. They are calculated for a 16:10 image; actual distances should be verified on site and against the OEM manual.

Image quality differs at the two ends of the zoom range: the image is brighter and the edges slightly softer near the short end, while the edges are sharper and brightness slightly lower near the long end. When the venue allows, use the middle of the range for the best balance. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

3. Compatible Models (5 Models)

The following table is taken from the OEM compatibility list. Brightness and resolution values are populated from the projector model database; unavailable values are shown as 「—」 and are not estimated.

To verify whether a model outside the list can be used, send us photos of the projector nameplate and the existing lens—projectors on the same-generation platform often share a mount, but the risk of ordering based on similar model numbers is not worth taking.

Throw Ratio by Model Series

The nominal throw ratio differs among the following series when the same XP-51ZL Short Zoom is installed. Use the value corresponding to the actual projector series when selecting a lens.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle will not cover the full image, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.53-0.65:1. Use the table in Section 2 to calculate the distance for your venue dimensions. Fixed-focus lenses have no adjustment margin, and zoom lenses need 10–20 cm of clearance at both ends of the range.
• Check the mount and locking mechanism. The OEM lens is calibrated for the mount of this projector series, and you must hear the lock engage fully after installation. A skewed image or soft edges are usually caused by incomplete lock engagement, not by the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the nameplate on the existing lens; physical verification is the most reliable approach.