Staring @ the Sun, 99

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Clear, Smooth Air


06/21/2022. This morning the air was still and dry, the sun brilliant. The mount's alignment in the south yard was good, focus looked spot on. So, just for shits and giggles, I tried a 10,000 frame clip. I used a 2400x2080 R.O.I. centered on the most active solar region of the moment. It's one of those "God's iron filings" displays. High clouds moved in late in the run -- I was getting 55 fps, but 10k frames still takes a while -- so I cut the sample short. This image is built from the best 2,000 frames of the first 8,500. The other images are from full-frame clips (which still come down at 50 fps and work well with careful flat-fielding).



If you don't click to make it big, you're missing a great deal of the fun.
Best 2,000 of 8,500 1.5ms exposures, unity gain.


Not that there's anything wrong with yesterday's take. Here's a colorful look at the same active region shown on the previous page as it begins to rotate off the face of the Sun. Make it big if you like.



Two full-frame clips. Best 500 of 2,000 each.


And here's today's look at the same region as it draws even closer to the receding limb (with apologies to Alan Friedman and other sungazers who have perfected the reversed-disk presentation I am working toward here). And yes, guess what happens if you click on it.



Full frame clip. Best 500 of 2,000.





My deep-sky photos are made with a variety of sensors and optics. Deepest images come now from a ZWO ASI1600MM Cooled Pro CMOS camera, an ASIair (model 1) and sometimes one of several laptops. A good many images come from an unmodded Canon 6D but a lot more will be coming from an R6. Video and video extracts begin in a Canon EOS M, usually running in crop mode via Magic Lantern firmware (but the 6D and especially the R6 will probably see more use). Telescopes include an AT10RC, an Orion 10" F4 Newtonian, and a pair of apochromats: a TMB92SS and a AT65EDQ. A very early Astro-Physics 5" F6 gets some use, too. So do lots of camera lenses on both the ASI1600 and on the Canons. A solar Frankenscope made using a 90mm F10 Orion achromat and the etalon, relay optics, and focuser from a Lunt 60 feeding a small ZWO camera will see more action as the Sun comes back to life (Autostakkart!3 is my current fav for image stacking). Mounts include an iOpton SkyTracker (original model), a bargain LXD-55, a Losmandy G11 (492 Digital Drive), and an Astro-Physics Mach1. PixInsight does most of the heavy lifting; Photoshop polishes. Some of the toys are more or less permanently based in New Mexico. I desperately hope to get back soon.


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                   © 2021, David Cortner