NP31ZL - Projector Accessory NEC - Free user manual and instructions

Product Type	Short Focus Zoom Lens
Model	NP31ZL
Brand	NEC
Compatible Projectors	NEC PX750U, PX700W, PX800X
Lens Type	Short focus zoom
Throw Distance (100")	PX750U: 1.6-2.0 m; PX700W: 1.7-2.1 m; PX800X: 1.6-2.0 m
Screen Size Range	40" to 500"
Lens Shift (Vertical)	Up to 0.5V (PX750U/PX700W) or 0.43V (PX800X) from optical axis
Lens Shift (Horizontal)	Up to 0.1H from optical axis
Focus Adjustment	Powered (buttons) and manual edge focus ring
Lens Memory Function	Supports storing lens shift, zoom, and focus settings
Mounting	Desk/front and ceiling/front projection
Cleaning	Refer to projector user manual
Weight	Approx. 0.5 kg
Dimensions (Dia x L)	Approx. 80 mm x 100 mm

Frequently Asked Questions - NP31ZL NEC

What projectors is the NP31ZL compatible with?

The NP31ZL is compatible with NEC PX750U, PX700W, and PX800X projectors.

How do I adjust the focus?

Use the powered focus via the FOCUS +/- buttons on the projector or CTL+VOL/FOCUS on the remote, then fine-tune with the manual edge focus ring.

What is the throw distance for a 100-inch screen?

For a 100-inch screen: PX750U: 1.6-2.0 m, PX700W: 1.7-2.1 m, PX800X: 1.6-2.0 m.

Can I use the lens memory function?

Yes, the NP31ZL supports Lens Memory. You can store and recall lens shift, zoom, and focus settings.

How do I clean the lens?

Cleaning instructions are provided in the projector's user manual. Generally, use a soft, dry cloth and avoid liquids.

What is the lens shift range?

Vertical: up to 0.5V (PX750U/PX700W) or 0.43V (PX800X) from the optical axis. Horizontal: up to 0.1H.

Is the focus manual or automatic?

The focus is powered (motorized) for overall adjustment, with a manual edge focus ring for fine-tuning corners.

Can I use this lens for ceiling mounting?

Yes, it supports ceiling/front projection. The lens shift and focus work in both desk and ceiling orientations.

What is the zoom ratio?

The NP31ZL is a short focus zoom lens with a variable throw distance range; exact zoom ratio is not specified but covers typical 1.2x to 1.3x depending on projector.

How do I store lens settings?

On the projector, use the LENS button to access Lens Memory. Adjust lens shift, zoom, and focus, then store using the on-screen menu.

USER MANUAL NP31ZL NEC

This manual discusses specifications and focus adjustment for the NP31ZL short focus zoom lens.

For cautions on handling the lens, see the User's Manual supplied with the lens.

For instructions on mounting, removing, and cleaning the lens, see the User's Manual supplied with the projector.

NOTE: The drawings in this manual may differ slightly from the actual product.

Specifications

Throw distance (Unit: m)

	Projector model name
Screen size (inch) PX750U PX700W PX800X
40” 0.6 - 0.8 0.7 - 0.8 0.6 - 0.8
50” 0.8 - 1.0 0.8 - 1.1 0.8 - 1.0
60” 1.0 - 1.2 1.0 - 1.3 0.9 - 1.2
80” 1.3 - 1.6 1.4 - 1.7 1.3 - 1.6
100” 1.6 - 2.0 1.7 - 2.1 1.6 - 2.0
120” 2.0 - 2.5 2.1 - 2.6 1.9 - 2.4
150” 2.5 - 3.1 2.6 - 3.2 2.4 - 3.0
200” 3.3 - 4.1 3.5 - 4.3 3.2 - 4.0
240” 4.0 - 5.0 4.2 - 5.2 3.9 - 4.9
300” 5.0 - 6.2 5.2 - 6.5 4.8 - 6.1
400” 6.6 - 8.3 7.0 - 8.7 6.5 - 8.1
450” 7.5 - 9.4 7.8 - 9.8 7.3 - 9.1
500” 8.3 - 10.4 8.7 - 10.9 8.1 - 10.2

TIP:

Calculation of the throw distance from the screen size (m)

PX750U: H x 0.75 to H x 0.93 : 0.62 m (min.) to 10.41 m (max.)

PX700W: H x 0.79 to H x 0.98 : 0.65 m (min.) to 10.91 m (max.)

PX800X: H x 0.77 to H x 0.97 : 0.61 m (min.) to 10.16 m (max.)

* “H” (Horizontal) refers to the screen width.

* Figures differ by several % with the table above because the calculation is approximate.

Lens shifting range

Button operations on the projector or on the remote control allow you to move the position of the projected image in the vertical and horizontal directions based on the following ranges.

Description of symbols: V indicates vertical (height of the projected image), H indicates horizontal (width of the projected image).

For adjusting the lens shift, see the User's Manual supplied with the projector.

PX750U/PX700W

Desk/front projection

Ceiling/front projector

PX800X

Desk/front projection

Ceiling/front projector

Adjusting the focus

1. Focus on the projected image around the optical axis. (Powered focus)

The drawing below shows an example when the projected image is shifted upward. In this case the optical axis is at the bottom edge of the projected image.

Adjusting with buttons on the cabinet

Use the FOCUS (+) or (-) button on the projector cabinet.

Adjusting with the remote control

Hold the CTL button and press the VOL/FOCUS +/- button.

* With the lens shift in the center position the optical axis is at the center of the image. In this case, adjust the focus at the center of the projected image.

Grid pattern with uniform black squares on a light gray background (no text or symbols)

2. Adjust the focus at the edges of the projected image. (Manual focus)

Turn the edge focus ring clockwise or counterclockwise.

This completes adjusting the projected image's overall focus.

- For zooming in or out, see the User's Manual supplied with the projector.

NOTE:

The NP31ZL supports the Lens Memory function, which allows you to store changes for Lens Shift, Zoom, and Focus.

If you accidentally move the Edge focus ring (drawing shown below) after having stored adjusted values, the adjusted values stored in the Lens Memory will not be correctly applied.

After having removed the lens from the projector and mounted it back, call up the adjusted values stored in the Lens Memory and then follow Step 2 in the procedure above to adjust the focus at the edges of the projected image again.