All DJI Phantoms have fisheye lenses, but since the Phantom 3 the images are corrected for this on the fly, so the images you download from the drone do not have the barrel distortion (ie horizons are straight). However with the Phantom 4 RTK it now give the option to have the photos with out this correction applied to improve the accuracy of the processing. The camera in the Phantom 4 RTK is identical to the Phantom 4 Pro, but in Pix4D they have different calibration parameters. The RTK camera (without 'distortion correction' turned on) is a fisheye lens, and the Phantom 4 Pro is a rectilinear lens. However, it you use the RTK with the 'distortion correction' turn on, then choosing the calibration file for the Phantom 4 Pro in Pix4D works just fine. I get what you mean about undistorted images not having camera parameters, but that just means they don't have real phyisical lens parameters, they can still have calculated/psuedo parameters, as they have for Phantom 3 and 4 cameras. I hope Bentley have added support for the Phantom 4 RTK camera to Context Capture update 12.
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