Measuring my Nizo Pro's shutter speeds. This one attached is a single frame taken at the 18fps setting and should hence be 1/43. Here is the output using a photodiode. I seem to have more peaks than is expected so not sure where I should take the start and end of the shutter opening time.
I'm using a a circuit like the one below (sans capacitor) and using a Bowens flood light. The photodiode is inside the camera body right behind the shutter gate. Recording to minidisc and opening in Soundbooth. And the PDF below also tells us how to measure the time from the wave form.
I've added an A, B, C and D to help identify the points I should be using.