2004-10-08-image-stack-test

These photos were taken in order to experiment with stacked images from a digital SLR. I used Mike Unsold's ImagesPlus Version 2.0 to stack these images. The camera used was a Canon EOS 1Ds DSLR.

The images shown here are 1/8th of their original size. Most of the detail is unfortunately lost at this scale. Click on the image or the "medium" link in order to see a half-size image. Click on the "big" link under the image to see the full-resolution 4064x2704-pixel image.



testStack1.jpg
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First attempt at image stacking using ImagesPlus. This image was constructed from ten 60-second exposures at ISO 800 using a 24-70mm lens set to 24mm piggybacked on my telescope. Because I used a wide lens, the front edge of my telescope is visible in this shot. I was surprised, given the wide-angle lens and the amount of light at the site, to see that M31 is easily visible in the enlarged images. While far from well-defined, M33 is also visible if you look at the highest-resolution version of the image. Stars are visible down to about magnitude 10--not too bad, all things considered! Taken from Savage, 10/8/2004. Taken from Savage, 10/8/2004.

testStack2.jpg
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Another attempt at image stacking using ImagesPlus. Ten 30-second exposures at ISO 800 using a 24-70mm lens set to 51mm piggybacked on my telescope. Taken from Savage, 10/8/2004. The bright star near the center is Altair.

testStack3.jpg
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A third attempt at image stacking using ImagesPlus. Nine 60-second exposures at ISO 800 were combined. The lens was a 70-200mm zoom at 200mm. Taken from Crockett, 9/18/2004. The contrast between these images and the unprocessed images is striking. There's some noise visible; a set of dark frames and flat fields are a must the next time I try this!


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