Purely distance, or stop rings?
Wonderfully atmospheric and the colors! Wowie!
Chris, just shooting position vs foreground vs background and also getting the light into the right angle.
Just the lens, no rings. A simple 4-dimensional optimization, that's all...
Admittedly, it was a very special atmosphere, just after a rain storm, when the sun broke through with full intensity.
A small but intense micro-hurricane we also had, which destroyed a wonderful old Cornus tree - sad.
***
Btw. this lens is highly underrated still, all world (esp. in Asia) rushes after the 2.8/100mm Trioplan, but this one can still
be had for little - not for very long I guess. Get the later, coated version...