1)I'd like to have a timer or circuit that would allow for longish exposures AND activate a solenoid to depress a cable release. having a display would be nice but a VR would work & I could put reference marks on a holder of some sort.
2)For the room of darkness a pair of timers, the first one actuating the second.
Again a display & separate controls would be nice.
3) Golly, it would be nice if the solution were simple & available at Radio snack, but I can work with perf board & point to point wiring