a question about the focus hold lens button.

[adwb]

I have a question about the Focus hold button/s on some lenses.
I am not sure I am missing something here but if you use back button focusing is not letting go also focus hold ?
I can see the point if you use the shutter button to focus and I see the focus hold can via the menu be set to other functions , for example eye AF or drive mode look like sensible options.

Is there some other benefit to focus hold on the lens that I am not understanding?

[bazinga1991]

I also have a related question. I have the 24-70 GM on my A7ii. I set the custom button on the setting for focus hold but when I press it, it doesn't work. Anyone know how to use it?

 

 

Sent from my iPad using Tapatalk

[adwb]

Do you not have to press and hold?

[Guest all8]

If you hold the lens and camera just right, this is much more fluid/stable than using the back button. And since you don't have to use the back button, you can assign that to something else.

 

Its apparently (I use this button a different way) useful to quickly separate Focus and Metering, half press shutter once to focus on target, hold the focus, reframe and half press again to meter, then reframe and compete the shutter press to take the shot.