A couple of questions her from me which I dont understand after looking and looking on google. I did find shutter speed vs shutter frame rate which made things clearer but:- I have seen it written that if you have the camera set to auto for the aps-c / super 35 then movie mode uses super 35 but on myA7r2 that does not happen i need to select it manually am I misunderstanding something? also for XAVCS there are the two choices of 25p 100M and 25p 60M 25 is the frame rate ? is that correct ? and should be matched to double the shutter speed =1/100 is that correct? 100M and 60M is the bit rate and 100 M will give a smoother video is that correct? if that is then correct then why is there a choice? I note that on XAVC S HD there is the choice of 50p 25p and 100p all at 50M compared to the XAVCS which only offer 25p So why is there a choice 3 frame rates avaialble for the XAVC S format?