David Busch’s Sony Alpha a7R II/a7 II Guide to Digital Photography

The slider lock is essential if you take exposures that last minutes. The remote control also has a dedicated button that starts a movie and a rocker switch that adjusts the focal length of motorized zoom lenses. In addition, it can be used on the Sony SLT series cameras. The previous remote control model for the SLT series cameras cannot be used o

If you regularly use long exposures, we recommend that you get the Sony RM-VPR1 remote control, which has a slider lock. When the camera’s shutter speed is set to B, the lock will allow you to open the shutter and keep it open with a single press of the remote’s button.

Thanks to the in-body stabilization system, Sony cameras can dampen the motion that occurs when you handhold long telephoto lenses, but be aware that using these lenses requires some additional thought. You will have to set the focal length of the lens as an option in the SteadyShot command.

You can rotate the front or rear dial to change the combination to other values, such as f/2.8 and 1/250 second, or f/5.6 and 1/60 second. Sony calls these changes Program Shift.