Aoraki Mount Cook National Park forms part of the Aoraki Mackenzie International Dark Sky Reserve – a 4300 km² region of the South Island where light pollution is strictly controlled enabling us to view truly dark skies – one of the best places in the world to do so. I’m lucky to have such a stunning location just a few hours’ drive from home. A popular short-walk in the park takes visitors to the outlet of the Tasman Lake where the Tasman River begins its short journey towards Lake Pukaki. As a reminder that the landscape around us is ever-changing, Tasman Lake formed just a few decades ago and its rapid growth is a result of the melting and retreat of the Tasman Glacier which is New Zealand’s largest glacier. Chunks of the glacial ice break off to become icebergs and drift down the lake towards the Tasman River outlet.
I’ve enjoyed coming to this location to make photographs for the past several winters and although I’m saddened by the thought that I’m witnessing the retreat of the glacier, I’m also able to fully appreciate the beauty of the scene it’s created. For me, the true magic of the scene is revealed in the darker hours from the time the sun has set and alpenglow is reflected by the snow-capped face of Aoraki Mount Cook through till dawn, when the snowy peaks are illuminated one by one by the light of the rising sun.
So late one afternoon, I headed to this popular spot with a group of friends for a session of astrophotography. The conditions were absolutely perfect at the lake; the water’s surface was still with not a breath of wind about to cause any ripples. As the sun set and twilight cast the landscape into the blue hour, I started to make a series of images. The first images were made to capture some of the detail of the foreground scene with icebergs floating serenely near the lake shore with Aoraki and the ranges of the Southern Alps dominating the midground. As twilight passed, the sky became a deeper blue and as darkness approached, the stars began to shine crisply in the cool night air. I lengthened the exposures I was taking so as to record the apparent motion of the stars across the night sky – rising from the east (at the right of the image) and moving in a gentle arc towards the west to meet Aoraki. I continued taking these “star exposures” for an hour which then gave me all the imagery I needed to create the final photograph. Fortunately the lack of wind allowed me to capture near-perfect reflections of the stars in the icy cool waters of the lake.
Star Trails, Tasman Lake reminds me of how important it is to stop – so that we can enjoy and appreciate the beauty of our natural landscape.
Image Details
Camera: Canon EOS 6D
Lens: Samyang 24mm f/1.4
Foreground Exposure: f/4*, 20s, ISO 800
Night Sky Exposures: f/4*, 4min, ISO 200 x 15 frames
Composite blend. * Estimated aperture setting using manual lens.
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