Sirius
Taken by Steve Brown on January 11, 2016 @
North Yorkshire, UK
Click photo for larger image
| |
Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable
|
|
| More images
Details:
Sirius is the brightest star in the night sky and often displays a dazzling array of colours as it twinkles close to the horizon. These colours are obvious to the naked eye and through the eyepiece of a telescope but more difficult to capture in an image. I wanted to show the flashing colours Sirius displays when viewed through the eyepiece of a telescope. To do this I had to somehow ‘freeze’ each colour as it happened. I did this by taking a series of videos at different levels of focus and then extracting the frames from each video to make up this composite image. By capturing the star out of focus the light from Sirius was spread out over a larger area, which resulted in the colours it displayed being more obvious. I used video to be able to capture a high number of frames in rapid succession, thereby recording each flash of colour as it occurred. The image is made up of 782 different frames at different levels of focus. There is a single frame of a focused Sirius in the centre of the image. To capture the video of Sirius I used a Canon 600D with 250mm lens, mounted on a Star Adventurer tracking mount, to keep the star steady in the frame. I've enjoyed using this method to capture Sirius and other bright stars since 2015.
Photographer's website:
https://twitter.com/sjb_astro
|
|
|
