Staring @ the Sun, 71
:: home ::
6/15/2014. I finished staining the porch early this afternoon (except, of course, for the inevitable touch ups) and then celebrated that sweaty job with an even sweatier one. I took the 90mm Frankenscope out for a stroll under an active Sun. First up, a flare factory in a relatively quiescent state, AR 2087:
Gamma 0, gain 45, exp 5ms, best 150 out of 1000 frames
Same tech bits. Mosaic of 3 frames. The image runs E-W but
I put these through 40 passes of Pixinsight's LR deconvolution, then adjusted curves, then 10 more passes. All passes were with 13x13 PSFs. A flat made from a defocused 100-frame clip works great to remove dust and other surface atrocities on the chip. I'm not happy with this processing; I need to get much better with Pixinsight; use it to suppress noise and avoid those odd highlights between sharpened greys.
6/30/2014. Bad seeing today inspired me to try severe selection criteria on clips: the best results came from using only the best 20 out of 1,000 frames. To rescue something worthwhile from the day's efforts, I spent some time playing with the deconvolution parms in PixInsight. Here's what I settled on after about 90 minutes of trials:
I do not for a moment think those are the best available settings, but they are better than the defaults when used with the 90mm Frankenscope at its maximum EFL and make a decent starting point. See:
Gamma 0; 7ms; gain 45 db
The irritating, spurious bright lines between over-sharpened grey regions seem almost absent or at least very much reduced. The short stack left the noise "louder" than I would prefer. The PixInsight settings are stored as a "project" under the name "90mm Solar Long EFL" in the directory "Photo-related/2014/solar". FWIW, I updated to PixInsight 1.8.4 before undertaking these trials.
July 2, 2014. Same active regions and a new one coming around the mountain:
:: top ::