08-11-2010, 10:31 PM
You say manual focus - how so? Did you use the scale on the lens body? If so, that's usually not accurate enough to get pin sharp stars. I use magnified live view on a bright star when I want to do this. I'm not sure on a good method without live view.
Even at 30 seconds at those focal lengths I would expect some trailing if you're not using a tracking mount.
Even at 30 seconds at those focal lengths I would expect some trailing if you're not using a tracking mount.
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