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Assembly and Operating Instructions for Kits


Operating Manual for the Light Sensor (LT2)


Assembly instructions for other kits


Light sensor control box

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Phototransistor cable

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Figure 1. Light Sensor control box Figure 2. Phototransistor cable


Powering the unit

Flip the ON-OFF switch to the OFF position (to the right in Figure 1). Then snap a fresh 9-V battery into the battery holder. It's recommended that you leave the switch in the OFF position until after you've connected the cables.


Connecting the phototransistor cable to the control box

Plug the phototransistor cable in to the jack labeled PT on the control box (upper right). Be sure that the plug snaps in completely.


Connecting the camera to the control box

In order to connect a camera to the control box, you'll need the shutter cable for your camera. This is purchased separately from the Light Sensor kit. See this page if you need a shutter cable.


It's recommended that you turn your camera off before plugging it into the control box. Also, flip the FOCUS switch (lower left) on the control box to the right. Plug the shutter cable into the jack labeled CAM (lower right) on the control box and into your camera's shutter cable port on the other end. At this point, you may turn your camera and the control box on. For some cameras, the camera shutter may actuate when you first turn on the control box.


Using the FOCUS switch

The FOCUS switch serves the same purpose as a half press of the shutter button. When using the camera in automatic operation, pressing the shutter button halfway will cause the camera to set exposure and focus automatically. When using the Light Sensor, flipping the FOCUS switch to the on position (to the left in the photo above) does the same thing as a half press of the shutter. The camera will focus and expose automatically if the camera is set for automatic operation. For photos taken using the Light Sensor, it's more likely that you'll be using your camera in complete manual mode. This will enable it to respond quickly to a triggering event and also to make sure that it maintains focus when working in the dark. Note that even when working in complete manual mode, some cameras still require that the FOCUS switch be flipped on. Nikon models are an example of the latter. Canon models, however, do not require that the FOCUS switch be flipped on.


After taking a photo, it may be necessary to flip the FOCUS switch off to review the image on the camera's LCD screen.


Adjusting sensitivity and testing the trigger

Sensitivity is increased by turning the SENS knob clockwise. The halfway position is a good starting point.


You can test the trigger indoors. Shining a flashlight toward the sensor should trigger the unit and actuate your camera shutter. You can test the sensitivity by moving the flashlight further away or directing the beam to the side.


The trigger will work in different levels of ambient light. You may need to adjust the sensitivity to account for the ambient light conditions.



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