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<blockquote data-quote="Whiskeyman" data-source="post: 154914" data-attributes="member: 13556">No need for that.&nbsp; Your opinion is just as worthy as mine here.&nbsp; I was primarily trying to address his specific questions, so I didn't include a lot of the items you did, like using a tripod and a remote release and setting the focus , which are absolutely necessary.I will ask you to go back to his original post and pay attention to the sky tracker he is utilizing in reference to your shutter speed advice.&nbsp; They shouldn't need to worry about star trails if his camera is placed on this equipment.&nbsp; They&nbsp; still need to limit exposure times, as you suggest, to reduce noise.However, when I work with the local astronomy club, using cameras mounted on clock drive mounts, I hardly ever use an ISO above 400 and always stop the lens aperture down to reduce spherical aberrations.&nbsp; If needed, multiple exposures can be taken if the camera is capable of that.&nbsp; With my D90, I just don't like the results when using an ISO setting of over 800.</blockquote>

[QUOTE="Whiskeyman, post: 154914, member: 13556"] No need for that. Your opinion is just as worthy as mine here. I was primarily trying to address his specific questions, so I didn't include a lot of the items you did, like using a tripod and a remote release and setting the focus , which are absolutely necessary. I will ask you to go back to his original post and pay attention to the sky tracker he is utilizing in reference to your shutter speed advice. They shouldn't need to worry about star trails if his camera is placed on this equipment. They still need to limit exposure times, as you suggest, to reduce noise. However, when I work with the local astronomy club, using cameras mounted on clock drive mounts, I hardly ever use an ISO above 400 and [I]always[/I] stop the lens aperture down to reduce spherical aberrations. If needed, multiple exposures can be taken if the camera is capable of that. With my D90, I just don't like the results when using an ISO setting of over 800. [/QUOTE]

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