I updated my tutorial because you're not the only one having trouble
with finding suitable buildings: It is okay if you take distortion
pictures at smaller distances.  Avoid distances smaller than one metre
though.  Only a few lenses exhibit a strong distance-dependence of
distortion and TCA.

 Taking pictures of leafless trees for TCA is okay as long as they are
not overexposed.  Avoid outshined edges.

 I would recommend night sky calibration only for fisheyes.

 What's the multi-image method?

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