Circular crop on for a rectilinear lens possible?

[Manuel Dahmann (kubische-panoramen-de)]

I use two filter in front of a rectilinear lens, that create a black, round shadow in the corners. How do I switch from rectangular to circular in the crop area to remove the shadow? That would be easier and more precise than removing it with masks.
Thanks in advance.

[Erik Krause]

Am 29.06.26 um 16:18 schrieb Manuel Dahmann (kubische-panoramen-de):

You can save and load masks to all input images at once, f.e. on Source
Images tab. Just select them all and load your mask (previously painted
and saved). You can also save a template which only applies the mask.
This can be set on Project Settings tab, Template Behaviour section.

But in fact there is a possibility to use circular crop even with
rectilinear images. You would need to select Circular Fisheye on Lens
Settings tab, enter the focal length manually and set the Fisheye Factor
to 1.0 See https://ptgui.com/faq#3_28 on why this works.

However, you lose the convenience to have lens parameters read from EXIF
data this way. In the end it might be better to use the mask and
template approach.

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

[Manuel Dahmann (kubische-panoramen-de)]

Great, thanks, that works. There are no lens informations in the images anyway.