Originally posted by stevebrot Some have long felt that flash "should" be possible for regular pixel shift, but it ain't.
Well, I successfully used flash in combination with Pixel Shift.
I cheated a bit by choosing long shutter speeds and a dark room so that I could manually trigger the flash four times.
However, the same approach can be automated and then supports faster shutter speeds.
The problem is that (IIRC) the camera does not provide four trigger events.
Nevertheless, with radio triggers or flashes that support a delay function (configurable in milliseconds) you can set up four flashes that fire one after another (with their delays aligned with the timing of the four Pixel Shift exposures). Using four flashes also addresses the recycling time challenge, i.e., you could use this approach to fire four full power flashes in sequence.
As photoptmist stated, one needs to pay attention to maintaining exactly the same exposure so one would have to find some way to align four flashes so that they all provide the same exposure. Using a diffuser or a bouncing technique and/or flashes supporting 1/10 exposure adjustments should address this. I understand that RawTherapee can already account for small exposure variations between frames, so when using such a refined post-processing approach, perfectly matched exposures won't be necessary.