However, there is one serious shortcoming - no external shutter release. (Why Sigma)?
Yes, it can be done with a servo but for hang gliding at least this is hardly ideal being fragile, power hungry and quite an extra lump of drag inducing stuff...
|clunky servo release|
HOWEVER... it turns out that it is possible to hack this camera with an external electronic shutter release. It's fiddly and requires some experience with surface mount electronics, but does NOT require the camera be extensively dismantled.
So, with the usual disclaimers that this will OF COURSE invalidate your warranty AND could irreparably wreck your camera even if you do know what you are doing AND could be partially or totally duff information - here's how its done:
Take out the battery and observe ESD precautions. 6 screws gets the rear cover off cleanly exposing a circuit board. Top right you see two SMD resistors. These give you access to the 1/2 press focus lock and full press shutter release switch circuits. If you can't imagine soldering something that small, STOP and get help.
|rear cover off|
The right resistor connects to 1/2 press switch, the left to full press. Connecting the bottom end of either resistor to GND via a 50R pull down will trigger the appropriate response from the camera. (I only need to operate the camera in manual focus mode remotely, so made a connection to the left resistor only).
|wiring to connector|
|external trigger connector|
|DP1s with Ricoh DW-6 & external wireless trigger|
|Airborne C2 over Laragne Charbre|