[rcolman]

I am just starting to think about pixel-shift technology.

Can I use pixel-shift with, say 20 second sky exposures, where the stars are moving, say 6 pixels or so over the course of the exposure?

What exactly does "multiple exposure" mode do? Will it "median stack" a bunch of exposures, or similar?

(sigh)

[Adam]

Can I use pixel-shift with, say 20 second sky exposures, where the stars are moving, say 6 pixels or so over the course of the exposure?

If a significant proportion of the scene is moving, you will gain no benefit from pixel shift. So for something like this, it would be best to keep PS off.

If you enable PS, the camera will take four 20-second exposures in total, resulting in a pretty big star trail and likely also artifacts due to the motion. Unless your tripod is perfectly still, you'd also get artifacts in the foreground because of wind, footsteps, etc.

Multi exposure mode is not related to PS, but it essentially stacks two photos on top of each other. It's like exposing the same frame of film twice (or more) but with correct exposure.

One thing you could do is use PS for the foreground only, then merge it with separate conventional photos of the sky.