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Thread started 12 Jan 2016 (Tuesday) 01:44
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Possible to create panorama from varying focal lengths?

 
Xerxes
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Jan 12, 2016 01:44 |  #1

I spent hours in the freezing cold to create an night time HDR cityscape. Unfortunately for the last few shots, while panning, I moved the focal length from 18 to 19mm, then to 20mm. Is there a way to use the shots, or am I doomed to smaller batch?




  
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Benitoite
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Jan 12, 2016 05:44 |  #2

Xerxes wrote in post #17854865 (external link)
I spent hours in the freezing cold to create an night time HDR cityscape. Unfortunately for the last few shots, while panning, I moved the focal length from 18 to 19mm, then to 20mm. Is there a way to use the shots, or am I doomed to smaller batch?

Seems like the pano softwares should be able to read exif lens data... Hugin does read lenses and ICE does ok in planar motion mode.
Example (auto cropped portion) from ICE. Focal length varied from 18 on up left to right.


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john ­ crossley
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Jan 12, 2016 05:53 |  #3

Xerxes wrote in post #17854865 (external link)
I spent hours in the freezing cold to create an night time HDR cityscape. Unfortunately for the last few shots, while panning, I moved the focal length from 18 to 19mm, then to 20mm. Is there a way to use the shots, or am I doomed to smaller batch?


Why don't you try it and see what happens.


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nathancarter
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Post edited over 3 years ago by nathancarter. (2 edits in all)
     
Jan 12, 2016 08:05 |  #4

It should work just fine. Or, to clarify, it will work just about as well as if you had not changed the focal length*.

Perspective distortion is not created by the lens or focal length; it's caused solely by the distance from the camera to the subject.

The longer-focal-length images will show less of the subject matter but have more pixels-on-target. The pano stitching software will handle this just fine, as it's got to reshape and resize and distort each image to fit with the next one anyway.

* There may be other factors, unrelated to focal length, that cause the pano to fail. For instance, if you rotated the camera in such a way that the nodal point of the lens moved significantly - e.g. standing still and swinging the camera in an arc, instead of fixing the camera on a tripod and moving your body around the fixed camera. This will be inconsequential if the subject matter is distant (e.g. a city skyline) but magnified if the subject is nearby (e.g. a 360-degree shot of a room interior, especially with tiled floors), perhaps to the point that the parallax error causes the pano stitch to fail.


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Xerxes
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Jan 12, 2016 12:27 |  #5

Thanks for the responses!




  
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Possible to create panorama from varying focal lengths?
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