Star Trail Reflections

By: Alan Dyer

Sep 14 2012

Tags: , , , , , , , , , ,

Category: Nightscape, Satellites, Tips and Techniques

1 Comment

Aperture:f/2
Focal Length:24mm
ISO:640
Shutter:45 sec
Camera:Canon EOS 7D

The stars of the southern sky arc over the peaks of the Lake Louise Range in this half-hour’s worth of exposures.

For this shot I took 35 frames from a 200-frame time-lapse movie and stacked them to create star trails moving over about 25 minutes time when the sky was dark and moonless. I also layered in the moonlit landscape from a frame taken at the very end of the time-lapse sequence when the Moon has risen and was lighting the mountains and trees. So this scene is a bit of a Photoshop fake, but only so far as to merge exposures taken a couple of hours apart from the same fixed camera to combine the sky and stars from when the Moon was not in the sky with the ground from when it was, so the ground isn’t too dark and featureless.

What most people find surprising about star trail shots is the range of colours displayed. Some of the magenta trails come from a little chromatic aberration in the lens. But nevertheless, stars do exhibit lots of colours, but usually only in time exposures like this. As a bonus one frame captures either a meteor or an Iridium satellite flare at right above Mount Victoria.

I took the images for this scene on Friday, September 7, on a shoot at Herbert Lake in Banff.

– Alan, September 14, 2012 / © 2012 Alan Dyer

 

One comment on “Star Trail Reflections”

  1. Nice!

    James

    RASC National Secretary http://www.rasc.ca (306) 728-4819 Mobile (306) 728-8722

    http://picasaweb.google.com/JamesPicsSK/Jameswood# Rule #1 – You can never have too many tools!

    > WordPress.com > Alan Dyer posted: ” The stars of the southern sky arc over the peaks > of the Lake Louise Range in this half-hour’s worth of exposures. For > this shot I took 35 frames from a 200-frame time-lapse movie and > stacked them to create star trails moving over about 25 minutes t” >


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