Splash photography kit
Indiglo50 wrote:
ProfHankD wrote:
drynn wrote:
I don't know these items (I made my own trigger) but in case you are not aware, it is the speed of the flash that captures the splash, not the camera shutter speed.
If you already know that then sorry for interrupting
Good point... with some caveats.
Some (not all) Canon PowerShots under CHDK can do mechanical shuttering to 1/30000s -- much faster than flash period for most flash units, but you'll need bright lighting for that. You also can sync the shutter firing to within about 1/1000s using CHDK to get everything ready and then wait for sensing of the USB port; the 1/1000s imprecision comes from the OS scheduling interval (jiffy) being 1/1000s. The CHDK motion detection function is slower because it is based on the live view stream, generally triggering within about 1/20s -- 1/20s after the droplet is seen is probably soon enough, and you can program additional delays in 1/1000s steps. I've used these CHDK features many times, but never for splash photography -- perhaps I'll try it and post some shots here (I'm rather busy right now)....
Most conventional cameras are pretty lethargic in responding to an external signal to fire the shutter, but you'd have to be working in a dark space to get away with just using a very slow shutter speed (seconds) and pulsing the flash. A typical flash pulse has most light emitted during between 1/3000s and 1/500s. In such a case, you usually trigger by audio -- a mic hearing the splash -- which has a little delay too. A laser diode & detector having the beam broken by the droplet is faster and more precise.
The unit discussed earlier in this thread doesn't actually sync the shutter nor flash -- it looks like it releases the droplet and knowing when that happens, can trigger camera/flash with a programmable delay.
Looks like I got to read up about this Cannon route. But I am still not convinced about the cost - Miops is only 20 bucks more. Why buy a new camera with inferior image quality. Are their other advantages that I am missing
Hackability. You can rather massively reprogram a camera using CHDK.
For example, it takes fewer than a dozen lines of Lua code to turn a CHDK PowerShot into a non-contact digital tape measure. Or a programmable metronome for playing music. Or a digital ambient temperature thermometer. I know that's not what you usually buy a camera for... but it's still cool.
On the other hand, the Miops device seems very purpose-built, and it probably will be the best documented, easiest, way to do the one thing it is designed to do.
Canon PowerShot SX530
Olympus TG-860
Sony a7R II
Canon EOS 5D Mark IV
Sony a6500
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