Originally posted by Adam No, because pixel shift is not appropriate for moving subjects, or if the camera is moving. I doubt any sort of tracker will be able to maintain pixel-level accuracy for exposures that long. Plus, remember that pixel shift quadruples the exposure time.
It will yield an increase in resolution when shooting perfectly stationary subjects from a tripod (i.e. product photography, landscapes when it's not windy, and cityscapes).
I respectfully disagree. I have a tracking mount I use with my 645Z for astro work and when I get it really well tweaked (leveled, dead on elevation and aligned with true N) using digital alignment tools, even after exposing five minutes there are no star trails whatsoever. I think the alignment error with pixel shift will be so small as to be irrelevant.
The real problem with long exposures of the night sky is that the images start revealing far more stars than you anticipate and the image becomes awash with thousands of points of light, making it very 'busy'. Other astro photographers have discovered the trick is to use high ISO and short exposures, eliminating the unwanted points of light, especially when shooting the Milky Way. Then stack the images. I imagine a series of a dozen or more images shot with pixel shift and then stacked, could be very effective.