I have a friend with an A100, nice camera for terrestrial images; but no software to to Live View or tethered shooting. Will do mirror lockup, so you can reduce vibration from this source. Noise at high ISO is a bit of a worry. You will require a good mount to use this camera because the camera will require looong exposures. My advice is to go with a Canon. The software is available, Nebulosity and other packages can talk to them.
YMMV
Regards,
Tony Barry
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