I have just gotten used to and appreciate the back button focusing on my D800. I love it and would not consider going back. However I do have a question as to how it works when the camera is on a tripod and you are using a cable release especially if on continuous focus.
The whole purpose of using a cable release is to not touch the camera before shooting. If I push my cable release halfway down without BB focus it will lock in focus and exposure. However with BB focus it will only lock the exposure (at least I think so since the focus is now decoupled from the shutter button).
So if I am set to continuous focus and on a tripod how do I in effect hold down the focus button without touching the camera? Or do I need to disable BB Focus when on a tripod?
The remote release functions the same as the shutter release button. If you have you camera set for AF-ON Only (A.K.A. BB) focusing, the remote will not activate the AF.
I use only BB focusing. When I have my camera on a tripod, I use the AF-ON button to focus the camera. After focus is achieved and any motion from touching the camera has stopped I release the shutter with the remote. I think this is preferable to having the remote activate AF, because I know for sure what I focused on.
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I am still rather new to AF-ON so I still have a question.
Do you ever user Continuous focus when on a tripod when shooting a subject that may be slightly moving within the frame? My understanding, if correct, is that with AF-ON and set to Continuous (AF-C) you need to hold the AF-ON button and it will lock the focus even if there is a slight movement of the subject within the number of active focus points. I have tried this hand held shooting technique on my dog who never sits still for too long. I focus on her eyes and use continous focus in case she moves her head. How would I do that with the camera on a tripod if the light is low and requires a slower shutter speed and hence a tripod?