Using the Long Roll Accessory
D-36 August 2001
Determining the Right Trigger Point 1. On the Film Controls window, click Position > to advance the film and
determine the “average” low number on the right LED.
2. Subtract the average low number from the highest number yo u recorded in
step 1 under Recording the Highest Numbers on the LEDs.
3. Divide the result of step 2 by 4.
4. Add the result of step 3 to the average low number determined in
step 1.
The result is the right trigger point. Record this number.
Below are examples of determining trigger points . Round to the nearest whole
number.
Average Low
Number Starting High
Number
Difference
Between High
Number and Low
Number
Difference
Divided by 4 Trigger
Number
120 800 800 - 120 = 680 680/4 = 170 170 + 120 = 290
98 814 814 - 98 = 716 716/4 = 179 179 + 98 = 277