Problem with horizontal photos

[mattia viappiani]

Hi everyone, I'm Mattia, I'm having a problem that hasn't happened to me before, shooting in HDR mode to perform a Virtual Tour with a Nikon D850 with a Nikon 8-15 mm Fischeye lens, all on a Nodal Ninja C2 Panoramic Head. Sometimes it happens that the 3 files at the Nadir or the 3 files at the zenith are in a horizontal position, that is, differently from the vertical position (Portrait) of all the others. It didn't happen to me if I shot with a Zeiss Otus 55mm lens. What can I do? Can it affect the stitching of the files? Thanks for anyone who wants to help me. Best regards from Mattia

un caro saluto da Italy

Mattia

[John Houghton]

Mattia, If you are shooting with the camera pointing more-or-less directly up or down, the orientation sensor can then generate unreliable data owing to gravity acting at right angles to the image plane.  So there's no up or down direction within the image.  Which way is "up"?  PTGui can deal automatically with mixed orientations, but you need to take account of possible differences in the positions of the optical centre of the lens by selecting the optimisation the individual lens shift parameters on the Project Settings tab.  Alternatively you can rotate images into the same orientation before stitching - maybe in raw conversion.  But take care to avoid upside down images.  It's not sufficient that they be all just in portrait or all in landscape orientation.  Another option with raw images is to go to the Project settings tab (before loading the images) and uncheck the option to physically rotate images with EXIF tag upon loading.  Lastly, you can avoid all orientation problems by disabling the camera's autorotate option, so you get all images in the same orientation. 

John

[P.vR]

As an alternative, you can also shoot your zenith & nadir shots with a slight angle. In that way, your camera is still happy to leave them as portrait.

For zenith, I use 60° up with a 16mm fisheye on my D850. As a bonus, I also have more overlap for stitching.

Similar for nadir.

Just my 2 cents.

Peter

[mattia viappiani]

Thanks to everyone who helped me with your valuable advice. I'll start by avoiding all the orientation issues by disabling the camera's auto-rotate option, so that all the images have the same orientation, as John suggested. Then I'll try the other solutions. Thanks also to Peter for the suggestions. un caro saluto da Mattia

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