How do I avoid distortion when stitching a DJI Air 3s Free Pano?

[twalp]

This is probably an easy one.

Below is a close-up of a small section of a Free Pano created internally by the Air 3s.

Here is a close-up of roughly the same section of what PTGui produced using the 18 DNG files that the Air 3s saved when making the same image.  I used Rectilinear projection.

How do I avoid or correct for the distortion?

Thank you.

[John Houghton]

Twalp, I haven't come across the Free Pano mode before.  Do the 18 individual images get loaded by PTGui into their correctly oriented positions automatically in a 360x180 equirectangular image?  Likewise, what happens when you load in the Free Pano?  What projection is that in?  You really want to align the two separate panoramas with each other so that you can extract identical (rectilinear?) selections for comparison purposes.

John

[PTGui Support]

Hi,

Your screenshot doesn't look like a typical rectilinear projection. It
looks like you may have Viewpoint Correction enabled. Could you make
your project file and source images available for download so I can see
what's happening?


Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 9/29/25 21:38, twalp wrote:
> This is probably an easy one.
>
> Below is a close-up of a small section of a Free Pano created internally
> by the Air 3s.
>

> CU of Air 3s free pano showing no distortion.jpg
>
>
> Here is a close-up of roughly the same section of what PTGui produced
> using the 18 DNG files that the Air 3s saved when making the same
> image.  I used Rectilinear projection.
>

> CU of right view showing distortion.jpg
>
>
> How do I avoid or correct for the distortion?
>
> Thank you.
>

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[John Houghton]

Joost, After a night's sleep, it dawned on me that this problem is very much related to  Mike Cowlishaw's recent Align to Grid issues.  The solution I suggested of aligning the two stitches together should work.

John