International Space Station cruised through the Big Dipper on the evening of April 26th, 2007. Canon 20D with 16-35mm f/2.8 Series L lens set at 16mm, ISO 800, f/8, Tungsten white balance. This is a combination of 46 30-second images taken with the camera mounted on a Losmandy G-11 Gemini Level 3 mount that was roughly polar-aligned. Three of the 46 images actually contained the trail of the ISS. No alignment was done of the individual images using any program similar to RegiStax. All images were stacked using Image Stacker, using the “brighten” mode. If the camera had not been mounted on a polar-aligned mount, long star trails would have resulted, ending with an image similar to one I posted earlier – 20 minutes total (4 5-minute each).
Clear skies!
Paul
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