Quote Originally Posted by Alan Gales View Post
Mamiya made a duel cable release. One press locks the mirror, a second press triggers the shutter. They show up on Ebay from time to time and are a little pricey.
Yes but these aren't really necessary ... as earlier stated you can simply plug a normal (and inexpensive) cable release into the lens, then fire the normal trigger which locks the mirror up, then fire the shutter in the lens with the cable release.

It's late, I'm tired, I'll try the T function tomorrow.