CHI L.D. Light Meter Pro Instruction Manual

1. Product Overview

The CHI L.D. Light Meter Pro is an advanced, compact device designed for film photographers, integrating both a precise light meter and a laser distance measure. This tool simplifies exposure and focus calculations, especially beneficial for vintage and rangefinder cameras.

• All-in-one functionality: Calculates exposure and distance with a single tap.
• Precise Spot Metering: The Pro version features a 7° ultra-narrow angle spot metering for pinpoint exposure control.
• Built-in Laser Rangefinder: Offers continuous-on laser mode for accurate focus from 0.1 to 50m, even in low light conditions.
• Clear OLED Display: A bright 0.96″ OLED screen shows ISO, shutter speed, aperture, distance, and EV readings.
• Rechargeable Battery: Includes a long-lasting 370mAh rechargeable battery with USB-C charging, providing up to 90 days of standby time.

Figure 1: The CHI L.D. Light Meter Pro, illustrating its dual light meter and laser rangefinder capabilities.

2. Setup

2.1 Unboxing and Initial Charge

Carefully remove the CHI L.D. Light Meter Pro from its packaging. Before first use, fully charge the device using the provided USB-C cable. Connect the USB-C cable to the port on the side of the device and plug the other end into a compatible USB power source.

2.2 Mounting on Camera

The L.D. Light Meter Pro is designed to fit into a camera's hot shoe or cold shoe mount. Slide the meter gently into the hot shoe until it is securely seated. Ensure the device is firmly attached to prevent accidental detachment during use.

Figure 2: The L.D. Light Meter Pro securely mounted on a vintage camera's hot shoe.

3. Operating Instructions

3.1 Power On/Off

Press and hold the power button (usually located on the side or top) for a few seconds to turn the device on or off. The OLED screen will illuminate upon power-on.

3.2 Light Meter Function

Once powered on, the device defaults to light metering mode. Point the meter towards your subject. The 0.96″ OLED screen will display recommended shutter speed, aperture, ISO, and EV values. The Pro version utilizes a 7° spot metering angle, allowing for precise readings of specific areas within your scene. Adjust your camera settings according to the displayed values for optimal exposure.

Figure 3: The OLED screen clearly showing exposure settings (shutter speed, aperture, EV, ISO) and battery status.

Figure 4: Illustration of the Pro version's 7° narrow light receiving angle for precise measurement, compared to the Lite version's 30° angle.

3.3 Laser Distance Measure Function

To activate the laser rangefinder, press the dedicated laser button. A red laser dot will project from the device. Point the laser at your subject to measure the distance. The OLED screen will display the measured distance in meters or feet. The continuous-on laser mode assists in achieving precise focus, especially in challenging low-light environments. For accurate focus with rangefinder cameras, align the laser dot with the camera's rangefinder patch until the images overlap.

Figure 5: Demonstrating the laser-assisted focusing capability, particularly useful in low light.

3.4 Mode Selection and Adjustments

The device features an intuitive mode dial and a one-button multi-mode design for quick adjustments. Refer to the on-screen prompts or the full digital manual for detailed instructions on changing settings such as ISO, shutter speed priority, or aperture priority modes, and switching between metric and imperial distance units.

4. Maintenance

4.1 Cleaning

Use a soft, dry, lint-free cloth to clean the device's exterior. For the OLED screen and laser lens, use a microfiber cloth specifically designed for optics. Avoid using harsh chemicals, solvents, or abrasive materials, as these can damage the finish or optical components.

4.2 Charging the Battery

The CHI L.D. Light Meter Pro is equipped with a 370mAh rechargeable battery. When the battery indicator on the OLED screen shows low power, connect the device to a USB power source using the provided USB-C cable. A full charge typically takes a few hours. Avoid overcharging the battery for extended periods.

4.3 Storage

When not in use for extended periods, store the device in a cool, dry place away from direct sunlight and extreme temperatures. It is recommended to charge the battery periodically (e.g., every 3-6 months) to maintain battery health.

5. Troubleshooting

5.1 Device Not Powering On

• Ensure the battery is charged. Connect the device to a USB-C charger and wait for at least 15 minutes before attempting to power on again.
• Verify that the power button is being pressed and held for the required duration (typically 2-3 seconds).

5.2 Inaccurate Light Readings

• Check for any obstructions on the light sensor. Clean the sensor area with a soft, lint-free cloth.
• Ensure the correct ISO setting is selected on the device to match your film.
• Confirm that the metering mode (e.g., spot metering) is appropriate for your scene.

5.3 Laser Rangefinder Not Working

• Ensure the laser function is activated.
• Check for any obstructions on the laser emitter or receiver. Clean these areas if necessary.
• The laser may have difficulty measuring distances to highly reflective or transparent surfaces. Try aiming at a different target.

5.4 Screen Not Displaying Correctly

• If the screen is dim or flickering, the battery might be low. Recharge the device.
• If the screen is unresponsive, try restarting the device.

6. Specifications

7. Warranty & Support

For warranty information and customer support, please refer to the documentation included with your purchase or visit the official CHI website. If you encounter any issues not covered in this manual, please contact CHI customer service for assistance.

Manufacturer: CHI

Seller: CHINOTECHS