James Markus wrote:
I gathered from my reading that digging details out of highlights without blocking up the shadows was the original motive for the standing development process. I'm amazed it works so well. Same roll, camera lens and f-stop as the others. Just faster shutter speeds.
Yep, that's been my experience at least. Semi-stand development has saved me in cases where I wasn't sure I nailed exposure or was using a film that is often described as contrasty. If the resulting negatives are not contrasty enough I can always increase contrast in post, but my goal is usually to capture as much detail in the highlights and shadows as possible so I can then adjust the digital file to my liking. I'm not sure if it would work so well for wet-darkroom prints, but I think it's a good approach when you're scanning.
Usually I've found semi-stand with Rodinal at 1:100 results in finer grain than I get with Rodinal at higher ratios (e.g., 1:50 or 1:25), but you still get all the sharpness. I've seen some people claim that the finer grain is due to the weaker dilution and others claim that it's due to the lower amount of agitation, but whatever, it just works!