jcolwell
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tuantran wrote:
Nice photos but is it just me seeing some photos having too much perspective correction applied?
There's a fine line between 'technically correct' and 'what it really looks like'. The issue is related to perception; when you're standing in front of something big, and look up, the parallels converge, but 'not as much as' when you point a camera up at the same angle, and you then view the resulting photograph.
Also, when you eliminate perspective distortion, it starts to look like a designer's drawing (e.g. plan view, profile view, buttock lines, etc.), but with a typical small format shift lens, you can only modify perspective on one axis (i.e. vertical or horizontal).
The second-last image posted by Ulff (with the beautiful grey tones) is an example where vertical perspective distortion has been eliminated, but horizontal perspective distortion remains. A combination of rise and shift (vertical and horizontal) movements could modify both vertical and horizontal perspectives, but that capability is pretty much relegated to MF and LF view cameras (and bellows systems), and it has practical limits.
This effect is similar to what I encounter when using PP to correct perspective distortion from a 'normal' lens pointed upwards; it's easy (at the cost of many pixels and some resolution) to make diverging vertical lines get "back to parallel", but the image then seems too stretched-up, and so I have to scale down the vertical dimension. Also, it's often useful to make those vertical lines somewhat less than vertical, that way I can still perceive that it's something tall, out there in front of me, not a flat drawing (i.e. it's useful to preserve vanishing lines).
FWIW. 
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