Errz
Senior Member
sad only for A7s.
Yes, it's the same (or similar). I never got to try out as EM1 still don't have it when I switched so I cannot be sure.
For the A7S app, you set the exposure to correctly capture the scene first, i.e. 8s f8 ISO400 for my case. When you press the shutter, it'll be like bulb mode until the 8s when the correctly exposed scene will show up on the. After that, it will continue to run to get the trails (which will show in almost realtime) and the scene will not be overexposed. Once you feel it's enough, just press the shutter again to stop and it can be saved as RAW as in my photo above.