Sunspots AR2628 and AR2627

Had a nice clear day, but windy and the seeing wasn't up to a good filter comparison. AR2628 on the left of the image may have enough energy for a flare. The images below illustrate the difference in quality of the best lucky image of 100 and the best of 300 images and faster exposure times during poor seeing.

This was made with the Baader AstroSolar Film ASTF80 white filter with UV/IR cut and #58A green filters. Questar 3.5" with a Sony a6300 at prime focus, best single image of 88. Exposed 1/20 sec at ISO 100. Deconvolved in Lynkeos with final crop, exposure adjustments, and yellow tint in Photoshop.

Taking a lot of images helps with less than ideal seeing. Here's a "luckier" image from a sequence of 207 at the end of the run.

Made with the Baader AstroSolar Film ASTF80 white filter with UV/IR cut and #58A green filters. Questar 3.5" with a Sony a6300 at prime focus, best single image of 207. Exposed 1/25 sec at ISO 100. Deconvolved in Lynkeos with final crop, exposure adjustments, and yellow tint in Photoshop.

With the mediocre seeing conditions a faster exposure time gives good results even with the UV/IR cut and green filters removed. I wish I'd thought to try this with the UV/IR filter in place. The image below was exposed at 1/125 sec, 5X faster than those above.

Made with the Baader AstroSolar Film ASTF80 white filter only. Questar 3.5" with a Sony a6300 at prime focus, best single image of 207. Exposed 1/125 sec at ISO 100. Deconvolved in Lynkeos with final crop, exposure adjustments, and yellow tint in Photoshop.

Content created: 2017-01-23

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