Hi Slobodan,
Thanks for taking the time to explain, much appreciated! I still don’t quite get it, although I ‘think’ to know a few things about perspective. But let me explain:
With reference to your first image we clearly see that the wooden beams, which are in parallel to the frame, continue to be in parallel and do not bend near the frames’ edges. I would expect this to be equal to the dock. I think your second image does not apply here.
Additionally, I’m pretty sure my 21mm wide angle lens does not have this kind of distortion.
Any possibility to enlighten me, are we talking here about linear perspective or barrel type lens distortion? If it's lens distortion causing the dock to bend than all is clear to me.
Regards,
Jaap.