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<blockquote data-quote="andy1read" data-source="post: 156223" data-attributes="member: 12426">thanks for the reply, There wasn't anything to hit the tripod, when I was changing settings to get the right exposure, and getting the focus right, I was going out to the camera and making adjustments. But once I started doing the star trail photos, I was sat indoors with my laptop which was connected to the camera with USB cable(and 5m extension) looking at the photos as they were sent to my laptop. One possibility is the USB cable might have tugged on the camera, I can't be sure but I don't think I moved it.I'm thinking maybe ,as it was at the start of an exposure. It was the action of the shutter release that caused a slight movement, and stayed stuck in that position for 20/30 seconds before returning to it's original position.&nbsp;It would make sense if a small bird landed on the lens, for 20/30 seconds then flew off, but you don't get many birds flying at midnight.</blockquote>

[QUOTE="andy1read, post: 156223, member: 12426"] thanks for the reply, There wasn't anything to hit the tripod, when I was changing settings to get the right exposure, and getting the focus right, I was going out to the camera and making adjustments. But once I started doing the star trail photos, I was sat indoors with my laptop which was connected to the camera with USB cable(and 5m extension) looking at the photos as they were sent to my laptop. One possibility is the USB cable might have tugged on the camera, I can't be sure but I don't think I moved it. I'm thinking maybe ,as it was at the start of an exposure. It was the action of the shutter release that caused a slight movement, and stayed stuck in that position for 20/30 seconds before returning to it's original position. It would make sense if a small bird landed on the lens, for 20/30 seconds then flew off, but you don't get many birds flying at midnight. [/QUOTE]

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