Fullframe or Circular
- From another thread:
----- Original Message -----
From: "Eric O'Brien"
> I'm using a Fuji S2 with the Nikon 10.5 lens.
> Just IGNORE the focal length and focal length multiplier fields.
> There is only one important value and it is "Horizontal Field of Field."
> For this lens, in portrait orientation, the value is somewhere near
> 86 degrees. That is, the angle of view across the SHORT side of the
> image is about 86 degrees. The other way, it's about 137 degrees.
> Just set Lens type to Fullframe and HFoV to 87.
With the Tokina 10-19 mm lens PTGui set it up as a circular lens if I let it take the values from Exif.
Which I believe is correct as it is a circular fisheye and that the same goes for Nikon 10.5.
When I HDR-proces the photos before stitching and loose the exif data I can set it up as fullframe.
I'm able to get a good stitch both ways, but the max pano-size is bigger for the fullframe setting!?
(for 2000x1330 input ~ 5400 for fullframe and ~ 5050 for circular)
I usually scale down to speed up things, so if I later want to make a fullscale is good to be able to reuse the pts-file.
This is possible with Fullframe as it is set to "no crop". With Circular the crop-circle is around the photo only touching the corners, so you have to redo the cropping for new size.
I think the fullframe is meant for corrected wide-angel , so my question is:
Does ptgui/panotools handles the remapping in different way depending on the lens type and does it have any impact on the final projection of the panorama.
Visually I do not notice any odities.
[Non-text portions of this message have been removed]
- Hi Fleming,
> Does ptgui/panotools handles the remapping in different way depending onIn presets it assumes values for a preview. After optimising, no. A
> the lens type
fisheye is a fisheye. All it does is define the crop format to maximize
the image fovs. The crop defines the fov of the image. A full frame
fisheye becomes a circular fisheye image on a larger sensor. A circular
fisheye becomes a full frame on a small sensor. The crop factor of the
sensor will define the image area. The mapping is defined by the panorama
setting output...rectlinear,cylindrical, psphere ect...
> and does it have any impact on the final projection of the panorama.No. But dont forget to reoptimize.
Here is a play for you:
-Load a project, you know gives a great equirectangular.
-Place the ptgui and the panorama editor window side by side on your
-Make sure only fov is checked for global optimization in optimizer tab.
-Now play with the lens type input and crop settings and watch the preview.
Go all out. Make a cicular fisheye to a full frame fisheye and over/under
crop and vise versa.
Make a fisheye lens to a rectlinear lens and crop it down to about 90° or
It will look weird in the panorama editor because the project values have
been applied for the lens and crop settings.
But reoptimization will bring it back to the set projection with the
correct lens fov. Equirectangular from any lens type used.
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> This is possible with Fullframe as it is set to "no crop". WithCircular the crop-circle is around the photo only touching the
corners, so you have to redo the cropping for new size.
> I think the fullframe is meant for corrected wide-angel , so my
> Does ptgui/panotools handles the remapping in different waydepending on the lens type and does it have any impact on the final
projection of the panorama.
>This is a problem of PTgui. In panotools there is C and S cropping. S
> Visually I do not notice any odities.
does not require reoptimization. Hugin use S cropping. PTgui uses only
Technically speaking panotools/hugin treat both types of fisheye
lenses as "Azimuthal Equidistant". BTW, not all fisheye lenses are
created equal. There is a rare bread of "Stereographic" which are
significantly superior, but more expensive, and I don't think there is
a single one in the market these days. Ortographic lenses also exist,
but are even more rare.
If you don't specify any cropping a circular fisheye will be cropped
automatically with a circle equal to the width of the frame as in the
JPEG (ignoring exif rotation fields).