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<blockquote data-quote="BackdoorArts" data-source="post: 226473" data-attributes="member: 9240">The BDH name is a long story, but I'd imagine there are enough &quot;Hippies Use Back Door&quot; signs up in Portland for you to at least get the starting point.What I meant by &quot;star trails&quot; is that at 18mm you have an effective focal length (due to the DX crop factor) of 27mm.&nbsp; If you use the &quot;600 Rule&quot; that means that any exposure over 22 seconds (600 divided by 27) will show motion in the stars, and that's evident in your 30 second exposure.&nbsp; So, if you want the stars to be pure spots in the sky and not a little blurry (&quot;with trails&quot;) then you can't shoot beyond 22 seconds, so you're going to need to be about 1.5-2 stops brighter to get the same exposure, and a f1.8 lens will more than do that for you.Are you using any kind of noise reduction?&nbsp; I highly recommend Dfine 2.0, which is part of the Nik Collection.&nbsp; If you don't want to spend that kind of money then play with the Noise Reduction in Lightroom.&nbsp; You should be able to come up with something usable, even at ISO 1600.</blockquote>

[QUOTE="BackdoorArts, post: 226473, member: 9240"] The BDH name is a long story, but I'd imagine there are enough "Hippies Use Back Door" signs up in Portland for you to at least get the starting point. What I meant by "star trails" is that at 18mm you have an effective focal length (due to the DX crop factor) of 27mm. If you use the "600 Rule" that means that any exposure over 22 seconds (600 divided by 27) will show motion in the stars, and that's evident in your 30 second exposure. So, if you want the stars to be pure spots in the sky and not a little blurry ("with trails") then you can't shoot beyond 22 seconds, so you're going to need to be about 1.5-2 stops brighter to get the same exposure, and a f1.8 lens will more than do that for you. Are you using any kind of noise reduction? I highly recommend Dfine 2.0, which is part of the Nik Collection. If you don't want to spend that kind of money then play with the Noise Reduction in Lightroom. You should be able to come up with something usable, even at ISO 1600. [/QUOTE]

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