SL2S 24-90 problem AF video / zooming

[Jox]

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Good morning,

I have a 24-90 and a 90-280 Leica on my SL2S, and I compared their behavior in video AF with that of the 24-70 F2.8 Leica.
I prefer the first 2 zooms in photos, but in video, I observed that their AF is lost as soon as you touch the focal length, while the 24-70 stays much better on the subject. Basically, you should not touch the focal length during the sequence, and it does the same thing without starting the video capture.
I tried to change the AF parameters (speed and sensitivity to the max), but it didn't change anything.

Is there a trick or
- should AF be banned in video if the sequence requires variations in focal length?
- should we use another zoom than these 2 excellent zooms that are the 24-90 and the 90-280?

thanks in advance

[frame-it]

or you could try this and see how it works with a zoom setting on the 2nd point:

 

 

Edited February 10, 2023 by frame-it

[Jonathan Levin]

When I use Nikon zooms (80-200) my method is to zoom to 200, focus, pull zoom back to my framing say 100. This assures focus, even if I zoom in during capture. Is this different on the L zooms? I think there is a term for this, but can’t remember.

[Jonathan Levin]

Also keeping a smaller aperture i.e. 11 or so. Maybe that wasn't the question.

[Jox]

Thank you for your answers.

In fact, Leica said "that is normal with this lenses" !

So, I use MF, ok

[LocalHero1953]

On 2/10/2023 at 4:59 PM, Jonathan Levin said:

When I use Nikon zooms (80-200) my method is to zoom to 200, focus, pull zoom back to my framing say 100. This assures focus, even if I zoom in during capture. Is this different on the L zooms? I think there is a term for this, but can’t remember.

Parfocal 🙂

But I think the OP is talking about something different, and the loss of auto focus with zooming. I haven't checked the SL zooms, but there was talk when they came out that they were parfocal.

Edited February 13, 2023 by LocalHero1953

[Malabito]

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This is due to the focus mechanism, the famous contrast detect

Lenses won't focus while you are moving the zoom ring. If you are using continuous focus and at the same time you start to zoom in/out while moving the zoom ring of the lens, it will stop focusing, this is function as design. 

This is due to the terrible focus implementation they have.

 

This is no longer the issue with s5v2, (at least that's what many are saying, I haven't used the s5v2), and hopefully it will be the same with the new leicas sl.

 

 

[Jox]

Ok, thank you very much for these answers.

If I have to zoom, I stay in MF!

And we'll see what the S5II and the next SL 2023/2024 gives...