DJI Mavic 2 Pro Lens Distortion

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    jasper

    Photogrammetry relies on the software being able to calculate all the neccessary camera and lens distortion parameters.

    If you're using images that have already been undistorted then the software will assume and calculate wrong values. So it is heavily advised to use distorted images.

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    Steven Caron

    Hey Jasper, thanks for replying... I am aware of how photogrammetry works. Have you used the Mavic 2 Pro DNG files? The lens profile is built-in and Lightroom/CameraRaw (from what I can tell) doesn't have a way to ignore the profile. It loads the file undistorted. I was hoping that RC's support for the M2P would include knowledge of this. Maybe the better question would be, does anyone know how to disable the built-in lens profile in the DNG? Hint on what the metadata field is?

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    Steven Caron

    I needed to strip the metadata, doesn't seem like Adobe wants to allow finer control over the application of embedded lens profiles.

    https://community.adobe.com/t5/Camera-Raw/Removing-Embedded-Profile-in-DNG-file/td-p/8984032

    Unfortunately, I now can't correct for vignette or chromatic abberation. 

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    Sam from sample & hold

    Hi Steven,

    Use Capture One Pro.  We ran in to the same issues with our Nikon Z7 24-70mm lens.  In Capture One you can set the lens profile to Generic rather than the lens pre-set.  We're now switching away from Adobe as there is no way, that we're aware of, to turn off its Automatic Distortion Correction.  You can grab a 30 day free trail of C1P.  I should point out, we're still testing this workflow to make sure it is sound so I suggest anyone who read this do the same before buying the software.

    Hope this helps.

    Sam

    See here: https://support.capturingreality.com/hc/en-us/community/posts/360005142280-Nikon-z7-Auto-Distortion-Control

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    Steven Caron

    Thanks for the tip Sam. I can't easily use Capture One Pro in my pipeline... I do have Affinity Photo and loaded the DNG up and am able to control the image the way I need for photogrammetry. I am doing more testing of my own but I think I will just need to formalize my ingest process to include a script to strip the metadata exactly how I need it and continue to use Adobe products.

    I would love some feedback from the developers about this! They should help their customers actually figure out the best result with the Mavic 2 Pro or any format that has these embedded lens profiles. If people are shooting JPG and then going straight into RC, they probably are getting higher error rates than they should if they went RAW/DNG and properly handle the distortion.

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