A few weeks ago I uploaded one of my stacked eclipse images in a previous thread. But in the mean time I did some more image processing.
Exposure settings: 20 images with 1/3200 - 4 sec exposure time, ISO 200, white balance: sunny, TS ED 60/330 APO with flattener, Canon EOS 70D.
Applied 8-16 dark frames for each exposure longer than 1/30 second (more dark frames for longer exposures) and 285 flat frames (taken with a white shirt in front of the telescope aperture).
Tracked with a Skywatcher StarAdventurer mount on a carbon tripod, stabilized by a half-full gallon bottle of mineral water attached to the tripod.
Here are three different versions:
Single frames stacked manually with Photoshop. For exposures shorter than 1/125 sec, I used prominences at the right hand side as a reference. For exposures longer than 1/125 sec, I used Regulus as a reference. For 1/125 sec I used both.
With Fitswork, I applied the Larson-Sekanina filter (5 different versions with radius 0.5 pixels and rotation 1, 2, 3, 4, and 5 degrees, respectively). I multiplied each of these filtered results with the original stacks. Then I removed artifacts (2 dark spots next to each brighter star) with the clone stamp tool in PS and stacked the 5 images together.
Very similar to this method: http://www.gva-hambu...fitswork_uk.htm
Total solar eclipse - Larson-Sekanina and Pellett combined:
At first, I applied the Pellett method (with a radial blur filter, amount: 10, method: spin, quality: best) as described by Jerry Lodriguss on his website ("more visually realistic method", thank you, Jerry, for providing this information on your website. And then I additionally applied the Larson-Sekanina-Filter as descibed above.
Total solar eclipse - Larson-Sekanina and Pellett combined 2 highlights reduced.jpg
I took the previous image and reduced the highlights somewhat to better show details close to the sun. This image is not quite visually realistic, but it shows a lot of coronal structures with a lot of detail.
Probably this is not the end yet... I'm still looking for ways to make the images better. I'd love to read about your suggestions... :-)
At next, I'll have to process the images of the second half of the eclipse. I still don't know how to merge all of the frames together. If I include all my totality images, I will get several moon images, because I use the corona and stars as references. If I use the moon as a reference, the corona would be smeared out.
Edited by Robin, 28 September 2017 - 02:04 PM.