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Hi Paul,
Looking forward seeing you at Snake Valley. Your 60Da is quite sensitive, so I'd start off with 800 ISO and do 120-180 sec exposures. For really faint objects, you can go 300 sec. I suspect noise may be an issue for anything longer than 300 sec, but have not used a 60Da so cannot comment on that directly.
For bright objects such as M42, I'd be tempted to do 400 ISO and around 60 sec or longer and then do a few 800 ISOs at shorter subs, again, just mixing up the exposure time and ISO in order to get a balance between detail and noise etc.
The other catch is light pollution. SV shouldn't be a problem, but for Melbourne burbs, you will need a LP filter. Other factors will include seeing/moisture in the air. When I was at Lady Northcote over Xmas/New Year, I got about a dozen 300 sec subs of the Horsehead, but had to bin them all as the seeing was really affected by a dewy night.
Hope that helps,
Bo
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