The HDR and interval trigger


Posted on Feb 7, 2014

This article explains how to build the second improved version of the HDR-Jack. In contrast to the original circuit this version is powered from a lithium coin battery. This results in compatibility with cameras not supported by the first version, because of the focus wire issue. The circuit can be easily embedded in the enclosure of a cable rem


The HDR and interval trigger
Click here to download the full size of the above Circuit.

ote controller as shown in the pictures below. The original function of the cable release is preserved. The following table lists all functions of the HDR-Jack 2. They are activated by pushing the small "extra" button. Modes 1 to 5 provide different bracketing series and an interval function. Modes 6 to 17 allow the configuration of the trigger. This is the all-purpose bracketing series with an EV step of 2. The nominal exposure times are 1/125, 1/30, 1/8, 1/2, 2, 8 and 30 seconds. The shortest time might vary strongly depending on the camera. The hold time of the button is used as the interval period. The duty cycle is approx. one. Example: Holding the button down for 4 s results in a trigger sequence with 2 s on and 2 s off. This is a short bracketing series for daylight conditions with an EV step of 2. The nominal times are 1/200, 1/60, 1/15, 1/4 and 1 second. The shortest time might vary strongly depending on the camera. This is a short bracketing series for daylight conditions with an EV step of 1. The nominal times are 1/200, 1/125, 1/60, 1/30, 1/15, 1/8, 1/4, 1/2 and 1 second. The shortest time might vary strongly depending on the camera. This is the all-purpose bracketing series with an EV step of 2 and mirror lock-up support. The nominal exposure times are 1/15, 1/4, 1, 4, 15 and 60 seconds. This is the all-purpose bracketing series with an EV step of 1 and mirror lock-up support. The nominal exposure times are...




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