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Two new articles posted: Using a 10-turn pot with a delay unit

and Selecting a flash unit for high-speed photography


Light Sensor Kit


The LT2 Light Sensor can be used to trigger a flash unit, camera, or wireless controller in response to a change in light intensity on the sensing element. The LT2 may be used for lightning photography or simply as a light slave.


The output of the trigger is an optocoupler; hence, your camera can be connected directly to the output and maintain electrical isolation from the trigger circuit. Wireless transceivers and flash units may also be triggered. (Flash synch circuits must be low-voltage, less than 80 V.)


The kit includes all the parts for the trigger control box and the sensor cable. Soldering is required for assembly. The circuit is assembled on a PC board, which is connected to components on the lid of the box. The circuit is powered by a 9-V battery.


A cable is needed to connect the LT2 to your camera. The shutter cable is not included in the kit. You can select a shutter cable below


Links to the complete parts list and assembly instructions are given below.

Parts list

Assembly instructions

Light Sensor LT2
photo by Ilija Dadasović (click to enlarge)
Light Sensor LT2

Light sensor control box

after assembly

LIght sensor cable
Light sensor cable
after assembly


$28.95 - LT2 Light Sensor Kit - (assembly required; shutter cable is additional)


Camera shutter cables

Select the shutter cable for your camera below. See the list of compatible cameras here.

Canon 80N3 cable with adapter Nikon MC30 cable with adapter Nikon MCDC2 cable with adapter
Canon 80N3 Nikon MC30 Nikon MCDC2
Canon 60E3 cable 3.5mm male-female extension cable 3.5mm connectors
Canon 60E3 3.5mm male-female extension Cable connectors (DIY)
  • The Canon 80N3 and the Nikon cables are about 1-foot long and may be coiled or straight, depending on what we can get from our suppliers. The stereo plug is 2.5mm, and a 2.5mm to 3.5mm stereo adapter is included for connection to a trigger box. A 6-foot extension cable may be purchased for just $1.95 more.
  • The Canon 60E3 cable is 6 feet long with 2.5mm and 3.5mm plugs.
  • DIY option: If you want to use a shutter release cable that you already own rather than buying one of ours, you can just get the 3.5mm male and female stereo connectors and follow these instructions.

Shutter cable option


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