The Exakta VX bodies are very robust. They don't have mirror lock up but when the shutter is fired the mirror stays up until wound again. Very minimal mirror slap compared to modern SLR's. The 2 shutter speed dials can be set for anything from 1/1000 to 12 seconds but both can not be wound at the same time or the camera will lock up and be useless. I found that out the hard way. Film can also be wound from one cassette to another and the built in film knife will separate the exposed film without using an entire roll. A very advanced camera for its day and still a good user. I have 3 of them still in great working condition.