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I have a non-motorized Newton 130/900 telescope.

Of course, it's hopeless to do pictures with exposure ~ 1 minute. Even 1 second is probably too much, as seen in Optimal exposure time for photography with unmotorized telescope.

Instead of doing 1 long exposure photography of 50 seconds (which would produce star trailing), can we do:

  • 100 automated photos of 0.5 second exposure time (each photo on its own has few star trailing)

  • an algorithm can reposition each picture to compensate the movement of the earth

  • at the end we merge the 100 (re-aligned) pictures to get a single picture.

It seems that, with this scenario, we get the same "number of photons" with these 100 photos, merged, as with a single 50-second-long exposure photo.

Is it a common practice?

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