Diana Cable Release Adapter The cable release adapter can be locked to make a really long exposure - without you having to hold it all that time. You can also opt to expose just as long as you press the cable release. This kit also allows you to take self-portraits!
Please note that if your cable release seems to be stuck in the "down" position, that's just the cable release lock doing its thing. Simply press and turn the disc clockwise around the plunger, and springy cable release action is yours!