Are you sure you don't mean like the B/T/I settings on an old lens? T means time, which is like Bulb except it will stay open after releases and only close after you click the trigger a second time, often used for very long exposures.


Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1, 5DmkII / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic | Sent w/ iPhone using Tapatalk