Three, if you count thinking about when to release the shutter and complete the exposure.
I usually get in some weight training and aerobics the week before planning to use MLU. It helps to be in shape for such strenuous and (often) tedious work. Imagine having to do that five or six times in a day with only a few moments rest between lock ups ;-)) Shel > [Original Message] > From: Boris Liberman > > We need true MLU .... > > Does true MLU mean that the photographer has to perform two actions on > their own - to bring the mirror up and to trip the shutter?
