This is my first try at astrophotography (a Canon 5D attached to a telescope). According to the manual the effective focal length is 2000mm. The top two images (of Jupiter) turned into star trails. The star is ten 1 second images stacked and aligned in photoshop. There is a technique for getting rid of the camera noise (dark frame) which I'll experiment with on my next attempt.
Tuesday, April 6, 2010
Stack Test
This is my first try at astrophotography (a Canon 5D attached to a telescope). According to the manual the effective focal length is 2000mm. The top two images (of Jupiter) turned into star trails. The star is ten 1 second images stacked and aligned in photoshop. There is a technique for getting rid of the camera noise (dark frame) which I'll experiment with on my next attempt.
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How did you stack the images?
ReplyDeleteI don't know if telescopes follow the same rules as a camera lens but if they do I would suggest trying a max shutter speed of 1/3 of a second at 2000 mm (600 / 2000). If you look at the dimmer stars you can see the beginnings of a trail - they are slightly oblong.
Camera noise is another issue. Starry skies can be cleaned up pretty well with a bit of Photoshop work. The lower the ISO you can use the better. I'll be interested to see how your tests come out.
Nice first go.