Straight Verticals with New Lens

[Conrad Rygier]

Hi, I've recently tried doing my first pano with my Sony A7iii and Sigma 8mm 1:3.5 EX DG Fisheye and I can't get the verticals to be straight.

In the past when I made panos with my Insta360 RS 1 inch camera I would go to align images, control points, add 2 sets of vertical control points and optimize and everything would straighten. Now doing the same process with my Sony A7iii and Sigma 8mm makes the whole image skewed. Any insight what might be going wrong?

before:

after

[PTGui Support]

Hi Conrad,

So the second screenshot is what you get after optimizing with the
vertical control points? That's weird.

Could you make your project available for download (source images + your
project file with the vertical control points)?

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 10/11/25 05:14, Conrad Rygier wrote:
> Hi, I've recently tried doing my first pano with my Sony A7iii and Sigma
> 8mm 1:3.5 EX DG Fisheye and I can't get the verticals to be straight.
>
> In the past when I made panos with my Insta360 RS 1 inch camera I would
> go to align images, control points, add 2 sets of vertical control
> points and optimize and everything would straighten. Now doing the same
> process with my Sony A7iii and Sigma 8mm makes the whole image skewed.
> Any insight what might be going wrong?
> before:

> Screenshot 2025-10-10 at 11.12.36 PM.jpg
> after

> Screenshot 2025-10-10 at 11.12.53 PM.jpg
>

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[Erik Krause]

Am 11.10.2025 um 05:14 schrieb Conrad Rygier:

> 2 sets of vertical control points and
> optimize and everything would straighten. Now doing the same process with
> my Sony A7iii and Sigma 8mm makes the whole image skewed.

Are you sure you didn't set horizontal or normal control points
accidentally?

PTGui defaults to vertical ones, if you have the same image in both
panes, otherwise normal control points are default.

--
Erik Krause
http://www.erik-krause.de

[Conrad Rygier]

Yes im sure I selected vertical control points. When I go to the control points menu, it's not defaulting to vertical points. I have to manually select vertical points.

[Conrad Rygier]

Here is a link to my source images and project files with the vertical control points added)

https://RygierHome.quickconnect.to/d/s/15MQgJEwGYWz94a3kw0qE5yirIGONPLv/Hv79p80BertnWXhvdKYIKdomUCmJomWy--r_gMaKopww

[Erik Krause]

Am 11.10.2025 um 17:16 schrieb Conrad Rygier:

> Here is a link to my source images and project files with the vertical
> control points added)

You must place the vertical line control point pairs on a vertical
feature as far as possible from each other. Best in the same image. So
if you use a window frame, open the respective image in both panes and
click on the frame in the topmost position in one pane and in the
bottommost in the other.

If the points are in the same location in two images, the orientation is
arbitrary.

[Conrad Rygier]

That did it! I didn't realize it had to be on the same image. Thanks!

[John Houghton]

On Saturday, October 11, 2025 at 10:41:06 PM UTC+1 Conrad Rygier wrote:

That did it! I didn't realize it had to be on the same image. Thanks!

To be quite clear, the vertical line control points should ideally be placed near the ends of a vertical feature, which might lie in different images if that vertical feature runs across more than one image. So it is not actually true to say that they must be placed on the same image.  When the two ends are in different images, you must take care to select the vertical line control point type manually before placing the points.

John

[PTGui Support]

Be sure to watch video tutorial #8 here:
https://ptgui-com.newhouse.nl/videotutorials.html

This shows how to level panoramas.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 10/12/25 09:33, John Houghton wrote:
> On Saturday, October 11, 2025 at 10:41:06 PM UTC+1 Conrad Rygier wrote:
>
> That did it! I didn't realize it had to be on the same image. Thanks!
>
>
> To be quite clear, the vertical line control points should ideally be
> placed near the ends of a vertical feature, which might lie in different
> images if that vertical feature runs across more than one image. So it

> is not actually true to say that they *must* be placed on the same

> image.  When the two ends are in different images, you must take care to
> select the vertical line control point type manually before placing the
> points.
>
> John
>

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