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Sunspot AR-2157 on September 13, 2014 with white light, 



Sunspot AR-2157 on September 13, 2014 with white light

Technical card

Resolution: 649x477

Date:Sept. 13, 2014

Time: 14:21

Frames: 226

FPS: 60.00000

Focal length: 3000

Locations: Suburban backyard N/O Seattle, Lynnwood, WA, United States


This image taken from best 5% of 4517 640x480 pixel movie center crop mode of my Canon 60D DSLR. The area outside the preumbra and umbra was overexposed causing it to turn mostly white, but this did brighten the sunspots themselves to reveal blue, red, and yellow colors. I am not familiar enough with the movie mode yet to know how to adjust the amount of exposure per frame or if that is possible. Next time I would like to reduce the exposure to capture more detail in the brighter background surrounding the sunspots.

I took 3 movie clips and adjusted the focus slightly differently each time and selected the one producing the sharpest frames. AutoStakkert was extremely slow to process 4517 frames with Drizzle because of insufficient physical memory (8GB), so I processed it without Drizzle.

I also took a 4th wide field movie clip in 1980x1080HD mode, but AutoStakkert reported a memory access error. AutoStakkert claims to support frame sizes up to 3000x2000 pixels but may require an update to its INI file to indicate the maximum size frames you wish to process. I need to check that out.



License: None (All rights reserved)


Sunspot AR-2157 on September 13, 2014 with white light,