Please note: The following article refers to our first product, Triggertrap V1 and not our current product, Triggertrap Mobile.
I keep getting questions about how fast, exactly, the Triggertrap V1 is, because people want to use it for high-speed photography. The answer is 'very fast', but that didn't make the high-speed photography crowd happy. I tried the following experiment: Set the Triggertrap V1 to the sound sensor, and then take a photo of my stop-watch. Now, the Stop-Watch makes a beep sound when it recognises a button press, and the sound sensor is sensitive enough to trigger based on that sound. So, the test is simple: Trigger based on sound, and read the time off the front of the stop-watch. Whatever number is read there is how fast the Triggertrap V1 reacted.
I had already measured the light sensor to be very fast - faster than 2ms (that's 0.002 seconds) - so I repeated the experiment with the sound sensor.
Triggering a flash with the sound sensor
Even after the test, I have to admit: I have no idea how fast the sound sensor is, but it is fast; When I trigger a flash based on the sound from my stop-watch (12 times in a row. Yes, 12. I kept repeating the test, because at first, I didn't realise that the test was working, because the stop-watch kept reading 00:00:00). In other words, it's faster than 10ms, but because the stop-watch doesn't have resolving speed beyond that, I can't tell you any more precision than that, I'm afraid. It's probably not faster than the light sensor, so I place the reaction speed at between 2ms and 10ms.
Triggering a camera with the sound sensor
There are many factors for why there is still shutter lag, even on very fast, modern cameras. I did this test with a Canon 550D (or the T2i, if you will), and consistently (5 times in a row) got the same result. In other words; whilst the Triggertrap triggers a flash in under 10ms, it takes 0.07 and 0.08 seconds to trigger a camera.
Stay tuned for more speed tests over the next few days; I'm currently devising a way of testing the speed of the light and laser sensors...