If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort". A virtual lighttable and darkroom for photographers. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels. Download Darktable - Darktable is an open source photography workflow application and raw developer. If set to specific, the focal length and crop factor can be set manually using the sliders provided. If set to generic a lens focal length of 28mm on a 35mm full-frame camera is assumed. Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing" start at the largest mm values and work down the list until you find something that looks closest to correct. This parameter controls the lens focal length, camera crop factor and aspect ratio that used by the correction algorithm. For the lens dropdown: Select Generic -> Rectilinear 10-1000mm f/1.0.Switch this combobox to distort in order to instead simulate the flaws/distortions of a specific lens (inverted effect). mode The default behavior of this module is to correct lens flaws. Click on the top (camera) dropdown list and select Generic -> Crop-factor 1.0 (Full Frame) Press the auto scale button (to the right of the slider) for darktable to automatically find the best fit.The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement. However, I have added it and it seems to be working quite well. It was taken with an X-E3 so not sure how accurate it will be for other Fuji cameras. But I did find some correction data for this lens. > 2 Some of the lenses were talking about were developed and (partially) > targeted to FF cameras having a sensor with less MP than a current APS-C > (for example in Canon, the 6D is a 2012 FF. Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. Correction data for this lens has been requested a few times on Github over the last year, but Im not sure why the lens is not yet in the database. A lens quality and specs is not defined by MP resolution (rather by like > purity of the glass, glass curvature homogeneity, CoC, TCA, and so on).
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