gyro question

I have done a shoot with some extra handheld shots, using the new (to me...) firmware for P4k.
How does the gyro actually work ?
I shot with a cine zoom, so Resolve does not know which lens was on the camera.
I do not see a field to enter at which focal length I was shooting ?

Am I missing something ?

Thanks...

I have done a shoot with some extra handheld shots, using the new (to me...) firmware for P4k.
How does the gyro actually work ?
I shot with a cine zoom, so Resolve does not know which lens was on the camera.
I do not see a field to enter at which focal length I was shooting ?

Am I missing something ?

Thanks...

You need to set the focal length during filming, in the lens metadata fields in the Pocket menu (swipe), otherwise it will consider it 18mm by default and have strange results.

Then in Resolve select Gyro from the options for stabilization.

75fps 2.41 gyro is broken at this moment in Resolve. Up to 60fps works great.

Oops. I did a one shot of 35 minutes, keeping video and audio rolling for sync. I rezoomed during the take from 20mm to 70 mm.

There should be a way to cut it up in post and enter a value by clip, while doing the stabilization.

Is there no way to change the metadata after the fact ?

Oops. I did a one shot of 35 minutes, keeping video and audio rolling for sync. I rezoomed during the take from 20mm to 70 mm.

There should be a way to cut it up in post and enter a value by clip, while doing the stabilization.

Is there no way to change the metadata after the fact ?

I don't think there is. For it to work properly you have to set it before you start shooting for lenses that don't transmit data automatically.

Maybe have a look into https://gyroflow.xyz ?

They have a very active Discord for support, and a Resolve plugin.

Yes, it’s a great tool. But you’d still need to know your focal length and then make calibration shots.
I’d rather avoid zooming if you plan to use gyro. One day, we may get frame-by-frame recording of lens data, which would be a blessing for VFX too.

In my experience, gyro stabilization is using the focal length from the beginning.
But it’s a pretty young feature, so continuous adaptation may come.

Unfortunately yes, you have to set it in the camera. You can’t ever enter it in Resolve, even if that field is editable. I mean, you can set it, but the value is ignored. Let’s hope that it’s still under construction.

The P6K recognizes the Sigma ART 18-35mm zoom’s focal length and distance on the lens data. There is nothing to set there. I believe it does so with supported lenses like the Canon L series EF as well.

Sorry, I did not notice the original post that it was about cine zoom

But how does the gyro stabilisation work on user interface level?

One needs to set the lens parameters before shooting and can not edit that on DaVinci Resolve?

Should see my self but have not found interest to do that.

You need to set it for lenses that don't communicate with the camera, otherwise it assumes they're all 18mm and will screw up results. This can be done via the swipe menu on the Pockets. You also need to disable any optical stabilization since it will interfere.

So its best used with manual lenses without OS or ones that have a physical OS switch.

But we should be able to set it in the stabilisation tool !

I have a 50 mm lens that us actually 55 mm. What happens if this lens tells the cam it is 50 mm, stabe will not work properly ?

Just let us enter a value in post.

The Sigma works fine for me, just don't zoom while recording.
And, yes, I'd really like to be able to set the value in DR. The difference between 50 and 55mm, though, shouldn't matter.

The Sigma works fine for me, just don't zoom while recording.

Uli, I noticed on the P6K (at least) that when you zoom the lens data for focal length and focal distance is automatically updated to reflect the zoom adjustment. I haven’t tested this but in this case I would assume the gyro data is being recorded on each frame reflects the lens data acquired. So with that said, you should be able to zoom with the Sigma and still have gyro info reflecting the zoom. This may not be the case for the P4K.

I my test, it was recorded, but not respected by gyro stabilisation. Meanwhile,we don't have the 6K around any more. We went back to other cameras, using an iPhone with the G-Fieldrecorder and Gyroflow.