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Occasional Contributor
Posts: 12
Registered: ‎08-26-2019

LV auto focus without shooting

Can I set up the camera so I can autofocus by touch screen but not take a shot?

Right now it only seems to work to autofocus if the camera takes a shot.
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Honored Contributor
Posts: 5,918
Registered: ‎11-13-2012

Re: LV auto focus without shooting

You didn't state which camera. On some models (maybe all) you can toggle between touch shutter on or off.

 

Annotation 2019-08-26 100224.jpg

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Occasional Contributor
Posts: 12
Registered: ‎08-26-2019

Re: LV auto focus without shooting

Sorry 80d

I know that I can toggle the shutter on/off, but it seems to also turn on/off the focus with it.
Honored Contributor
Posts: 5,918
Registered: ‎11-13-2012

Re: LV auto focus without shooting

If you disable touch shutter then focus and exposure are controlled by main shutter button. Touch screen where you want to focus and half press shutter button.
John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Occasional Contributor
Posts: 12
Registered: ‎08-26-2019

Re: LV auto focus without shooting

Thanks for the prompt replies.

If I do that, then what is it using to focus?

My understanding is that when you use live view focusing that it is using contrast detection. When using the view finder then it's phase detection (not that I know how that works yet).

If I am in live view but use the shutter to focus which one am I using to focus with?
Honored Contributor
Posts: 5,918
Registered: ‎11-13-2012

Re: LV auto focus without shooting

You are using Live View focusing in either case - touch or button. All that changes is how focus is activated.
John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Valued Contributor
Posts: 492
Registered: ‎02-13-2016

Re: LV auto focus without shooting

I think the choice of focusing mode is all a matter of whether or not the mirror is in the locked-up position. Live View only works when the mirror is in the locked-up position.

Occasional Contributor
Posts: 12
Registered: ‎08-26-2019

Re: LV auto focus without shooting

Good to know.

Makes sense that the mirror being up would make it work that way.

Thanks!
Honored Contributor
Posts: 5,918
Registered: ‎11-13-2012

Re: LV auto focus without shooting

How pahse detection works:

 

https://fstoppers.com/education/excellent-explanation-how-phase-detection-autofocus-works-269078

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Occasional Contributor
Posts: 12
Registered: ‎08-26-2019

Re: LV auto focus without shooting

Thanks. that was interesting.
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