I have the Olympus OMD and its very nice for astrophotography.
The Pros:
- Excellent live view capability (In my 12" Dob, Individual stars could be just resolved in 47 Tuc with liveview)
- High sensitivity (similiar to Canon/Nikon).
- Very compact, but rugged
- Excellent in-body stabilisation (3 stops easily).
- True raw files - the raw files appear untampered.
The Cons:
- Can't do tethered control (apart from remote shutter, for bulb mode, etc)
- Relatively little software support
To be aware of (could be a pro or con).
- Smaller field of view as well as smaller pixels.
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