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06-17-2020, 10:45 PM   #1
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How does focus work with video?

How does the focus work with video? I had an AF lens today and for one of the few times I was attempting to create a video with my K5 of my roses in my rose bed. Well near everything was out of focus, although if I held the lens there long enough it seemed to try to focus. I tried manually focusing and autofocusing. How does the focus work? What type of lens should I use to take video of things that are near?

06-17-2020, 11:41 PM - 1 Like   #2
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You can do AF-S focusing, but autofocus is not how films are made, anyway, and DSLRS and MILCs are influenced by the cinema world, not camcorders.

So, manual focus is the standard.

You don't want the focus to jump from one object to another or hunt, and you want any change during a scene to occur at a nice rate controlled by the camera operator. A focus puller is a second cameraman, and that's all he does, it's a specialist skill.

It's like zooming in, it's such an amateur move. That should be edited out before people see it, unless there's a specific dramatic effect being achieved.

Last edited by clackers; 06-17-2020 at 11:46 PM.
06-18-2020, 01:55 AM   #3
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agree,
use focus peaking if possible on your model..
06-18-2020, 05:06 AM - 1 Like   #4
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You have two choices.
First is using a film era lens and Follow Focus rig, this will give you proper focus and it'll be focused where you want it.

The second is to focus an AF lens before shooting, clicking AF Off, and then hitting record.

IIRC, the default settings will have the focus lock in place when you hit record anyway.

Focusing on the barrel of any brands new AF lenses is a real pain - they're just not designed to be used manually, so don't have the throw on the focus ring to do it properly. Canon's L-series lenses are particularly bad in this respect.

Easiest way to refocus on an AF lens while recording, is to use Back Button Focus, and have the focus set to a Single spot.


@ Clackers - Zooming In while Tracking Out,.. or Zooming Out while Tracking In,... that's no amateur move

06-18-2020, 12:42 PM   #5
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QuoteOriginally posted by PiDicus Rex Quote
You have two choices.
First is using a film era lens and Follow Focus rig, this will give you proper focus and it'll be focused where you want it.

The second is to focus an AF lens before shooting, clicking AF Off, and then hitting record.

IIRC, the default settings will have the focus lock in place when you hit record anyway.

Focusing on the barrel of any brands new AF lenses is a real pain - they're just not designed to be used manually, so don't have the throw on the focus ring to do it properly. Canon's L-series lenses are particularly bad in this respect.

Easiest way to refocus on an AF lens while recording, is to use Back Button Focus, and have the focus set to a Single spot.


@ Clackers - Zooming In while Tracking Out,.. or Zooming Out while Tracking In,... that's no amateur move
Thank you all. I think I went wrong yesterday by trying to change from autofocus to manual focus mid-video, and no matter what I did, the focus did not work. I will try one of my manual focus lenses, instead.
06-18-2020, 11:24 PM   #6
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QuoteOriginally posted by PiDicus Rex Quote

@ Clackers - Zooming In while Tracking Out,.. or Zooming Out while Tracking In,... that's no amateur move
Correct, that's why we'd hire you, Stew… you have the skilz!

Exposure is also something that needs to be manual. We can't have a pan where it goes up and down, the editor would have a fit!

Last edited by clackers; 06-18-2020 at 11:34 PM.
06-19-2020, 01:26 AM - 1 Like   #7
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Gawd I hate being called 'Stew',....

Funny thing, mate of mine has same first and middle names (his Dad is from similar area of Scotland as my Dad's family, we think it's a common name thing..).
On set, everyones gotten used to me ignoring anyone who says 'Stew', while he answers, and they say 'Stewart' if they want me to answer.


Story Time:

One of my AC's got hold of an Aputure Lens-Regain, and we had it in front of the Cion with a Sigma EF mount lens, with the focus controlled Manually by remote, for a green screen shoot where the actress takes a few steps forward and delivers her dialog, to be composited in to an alien background.

So even though it's electronic control, and can have end stops and rates set, it still relies on a skilled AC to run the Focus Pull.
It's very rare to use any sort of AF in Film or TV production, it's usually limited to B-roll cameras on News stories - on the sort of smaller camera issued to the reporter, not the Cammo
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