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with your camera being an APS-C sensor, you have to take into account cropping. The focal length is designated for a full-frame camera, so your lens will be an effective 88–400 mm on your camera. The advice posted so far has been pretty good. Can't think of much else to add other than consider not fully extending your tripod depending on its stability and playing with your ISO settings if you want a shorter exposure. On my sony nex 5n I took a shot last night of the moon. I have a 200mm F2.8 lens (so 4X as fast as yours, but not as high magnification) at ISO 100 for 1/1000 seconds at F4. I took one at F2.8, but I felt that the slightly longer exposure at F4 looked better somehow. For you, this would equate to something around 1/250 seconds at F8 on your lens.
If your mirror makes a noticable vibration when it "clicks", this can also affect your image due to movement. One option here is to take a longer exposure and hold a piece of card in front of the lens when you take the image, then hold the card back in front before the image ends.. if that makes sense. So for instance, you could take a 5s image at ISO 100, at the smallest aperture you have (F32), hold the card in front of the lens and set your camera to take the photo. After you hear the mirror "click", you can remove the card without bumping the lens, count to say 4s, then put the card back in front.
cheers.
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