Is there a button (or custom function which could be assigned to some button) to auto-adjust exposure in Manual exposure mode on Sony Alpha 7?
I am a new A7 user, and didn't find one yet.
On other cameras (several Ricohs, for example) there always was a way to switch to a manual mode so shutter speed/f-stop value won't change all the time depending on how much of a cloudy sky you have in the frame, and after that you could point a lens into the asphalt road (relatively grey when not wet), press that button and it was kind of assurance you'll get properly exposed pictures for THIS kind of lighting. And then – going from let's say shadows to sunlit areas I'd press the same button again pointing to the asphalt (or my palm – about the same fake 18% grey from the exposure measuring point of view), and pressing it again to adjust to changed lighting.
Wondering if there is such a button on Sony A7 – to bring shutter speed (or auto-adjust ISO) to a proper value ones, and keep it at this level until that button is pressed again.