NEC NP39ML Fixed Ultra Short Throw Lens: Compatible with PX1004UL-B-18, PX1004UL-BK, PX1004UL-W-18

NEC Original Lens NP39ML Fixed is a genuine optical accessory for NEC installation projectors, belonging to the Ultra Short Throw category with a throw ratio of 0.38:1. The original compatibility list covers 8 projector models; before installation, simply verify against the projector model and panel size — no adapter rings needed. The value of an original lens isn't about a few extra rows of numbers in the spec sheet, but 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 all match 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 mount type not shown in the spec table, please verify with us against your projector model — ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is fixed-focal (0.38:1), so the installation distance changes linearly with image size and has no adjustment margin — it must be measured accurately before installation.

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space behind the projector body. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

3. Compatible Models (8)

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 check whether models outside the list are compatible, please send us photos of the projector nameplate and the existing lens for verification — same-generation platforms often share mounts, but ordering based on model similarity is a risk not worth taking.

Throw Ratios Across Model Series

The same NP39ML Fixed installed on the following series does not have the same nominal throw ratio; selection should be based on the actual series of your projector.

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. The original lens is designed for a specific panel size; with a different panel specification, 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 0.38:1; apply it to your venue dimensions using the table in Section 2. Fixed focal length has no margin; even for zoom lenses, leave 10–20 cm at both ends.
• Check the mount and locking. The original lens is calibrated to the mount of that projector series; after installation, you must hear it lock 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.