What does MLU mean?
MLU means that you can manually lock the mirror in the position where it’s out of the light path to the film. This is done before shots where the slap of the mirror being raised might shake the camera enough to induce movement unsharpness of the image. You will only need that feature if you plan to do close-up photography, or other even more specialized forms of photography, such as long exposure. Many recent SLR’s in the mid-top range have mirrors that moves so gentle that you won’t need MLU in most of the cases where it would be necessary with older cameras. When you press the shutter release on an SLR, the mirror swings up to allow the image to pass through the lens, through the open shutter, and to the film. The shutter closes and the mirror swings back down into viewing position. Obviously, this happens very quickly, and causes a slight vibration. Normally, this vibration is not a problem but if you are doing close-up/macro work, where depth-of-field is miniscule, and focus is cri
