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Thanks JA
This is a path I have recently gone down. Tossing up between the Nikon D700 and the A7s both with 8.4 micron pixels.
I have gone with the more modern A7s and will use 30 second exposures to avoid bulb mode and the star eater problem that you hear so much about with these cameras.
30 seconds at f1.9 is more than enough exposure time and the colour sensor will be excellent for comets.
The A7sIII looks impressive since it is supposed to have a back side illuminated sensor and 8.4 micron pixels. Don't know if it will be suitable for astrophotography though.
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