Quote Originally Posted by AgX View Post
Any idea how this is achieved?
I think any consistency as down to how you press the release. in the web page Paul linked to, it suggested a shutter speed of 1/5 to 1/20 depending on cable release pressure.

Most of the travel of the cable release is taken up with opening the blades. Once the travel gets to about 90% the blades snap shut again. I think that if you press the release quickly you will be more consistent than trying to do it slowly.

I notice that the web page also suggests that shutter speeds up to five seconds can be achieved on the B setting. Not sure why they say that as you could keep it open forever.