I've modified a Canon remote release for the 20D and 1D MKII N adding a plug on the back to take an external signal to trigger the camera. This gets away from the problem of sourcing the Canon connector for these cameras. I can either set the system to use the nromal expsoure system, or mirror lockup with a timed exposure or Bulb mode triggering the flash
Subject matter is anything :-) birds, animals, frogs, snakes etc etc. I just want to develop the system so it can do most things with a faster response time that I can achieve with my finger and more reliably. Played with some water droplets last night using a lashed together system and I can consistently photograph a droplet at any height above a surface or at the moment of impact. Interesting results
but most importantly repeatable results without me physically having to trigger the camera myself.
I won't be planning to leave the system completely unattended espeically if the 600mm is on the camera lol
The best thing about it is the build cost, less than £100 in comparison to £600 and more for commerical systems