I have had a go with your images and find the continuum image gives the best granules but the 450nm-40nm image gives some lovely fine details around the spots and some interesting lines between the large spot groups to the single spot in the middle that's lost on the continuum image. Thanks! As for...

Thanks, everyone.

Montana wrote: ↑Mon Jul 04, 2022 9:06 am What a location Filip!! have you recently moved there?

It's great, and even has two ice-cold lakes (half-frozen until May) I moved a few months ago; I live about 90 minutes away now, so I'll be going there again for sure (also for planetary work later this year).

If anyone's interested, here are the best raw stacks for each filter. Feel free to post your processing results, I'm curious to see what you can get out of it.

On Saturday I decided to see if Meteoblue's enticing seeing forecast (~0.6") for the Flüela Pass in the Alps (2384 m/7822 ft) is true, and drove there with all the gear. TL;DR: it was very good indeed. I was using the Intes M715 (180 mm f/15 RMCT) with Baader ND 3.8 solar film, Baader Solar Con...

Great animation! I love how thick the "curtain" is.

but i have a cheap solar film ND5.0, can this be ok? Will work under certain conditions, see this post . What conditions? How to know? Just what's mentioned in the post: 1) don't use very big F-numbers (i.e., don't Barlow too much) 2) don't use very narrowband filters (e.g., Solar Continuum) The go...

TareqPhoto wrote: ↑Fri Jul 01, 2022 10:17 pm but i have a cheap solar film ND5.0, can this be ok?

Will work under certain conditions, see this post.

Nice work!

Some of the tables pasted into and plotted in LibreOffice Calc (X axis = "xpos"):

3. collimated 50% air-spaced etalon using collimating lens on an f/7 scope
6. air-spaced etalon on f/30 scope

Thank you, everyone. That Intes seems to be working very well Indeed! For now (at 540 nm) it's on par with my old SW Mak 180, but since it's a Rutten-MC, I'm hoping for equally good results - and higher resolution - at near UV (judging by this analysis by Christian). I've already got a few broadband...

The seeing on Thursday was mediocre, but my 3-hour session yielded a few good stacks. All taken with Intes M715, Baader ND 3.8 solar film + Solar Continuum filter, Blackfly S (IMX 273), processed with AS!3 and ImPPG. ar_3038.png High-cadence granulation time lapse (my first; the old ones from 2012 u...

The seeing on Thursday was mediocre, but my 3-hour session yielded a few good stacks. All taken with Intes M715, Baader ND 3.8 solar film + Solar Continuum filter, Blackfly S (IMX 273), processed with AS!3 and ImPPG. ar_3038.png High-cadence granulation time lapse (my first; the old ones from 2012 u...

Great work. That filaprom shot is insane.

So far I also have got the best results broad band results with a 180 mm f15 mak from skywatcher. Oh, I don't doubt it - I absolutely loved my "golden tube" SW Mak 180, which I had between 2012-2014 (esp. for the Sun and Jupiter, like here https://astrob.in/23109/0/). I decided to get ano...

Unpleasantly hot today, but I managed to test my new Intes M715 (180 mm f/15 Rutten-Maksutov-Cassegrain). I haven't checked the collimation yet, might need some tweaking. The seeing was unfortunately too unstable for an animation: ar_3038.png ar_3030_3032.png Blackfly S (IMX 273), Baader ND 3.8 sola...

Cracking images!

Yeah, it was an M class, I managed an animation (see this thread).

One can use ND 5, but it becomes suboptimal when you push the setup towards optimal sampling and contrast. E.g., at f/16 and with Solar Continuum (which is quite narrow at 8 nm), ND 3.8 led to about 7 ms exposure (at zero gain, with histogram at 80-90%) with the ICX445 sensor (newer ones might be be...

That's a great image.

In the not-too-distant future you should be able to use a Mac-native version of ImPPG, thanks to a contributor who's working on ironing out some compilation kinks.

Thanks, that's a very cool video. As to the "how" of L-R deconvolution in particular, I didn't ponder it too much - just read the Wikipedia article , and implemented the described operations. It has been shown empirically that if this iteration converges, it converges to the maximum likeli...

I can speak to what ImPPG does: non-blind Lucy-Richardson deconvolution with a Gaussian kernel. It assumes that the original, sharp image (as would be seen by your telescope placed just outside Earth's atmosphere) has been effectively¹ convolved with a Gaussian kernel. As if someone just applied &qu...

Nice work! What do you use for collimation/refocusing, singlets or doublets?

Beautiful animation.

What time intervals did you use?

@Pablito had been using a 150 mm f/10.

Thank you, everyone.

I'm thinking more and more about getting that intermediate 120-mm class setup for Hα and CaK.

Even a modest flare could power humanities global needs for many millennia, perhaps far longer. Hundreds of thousands of years or more. Good point, but for millennia - only a really powerful one. Per Wikipedia , typical energy release is 10²⁰ J, up to 10²⁵ for major events. Humanity's annual energy...

Great video; I love the "ignited gasoline puddle" flare. Consider making MP4/H264 videos instead of GIFs. Unlike video hosting sites (Vimeo, YT), which re-encode what you upload and in our (solar) case ruin fine details, by encoding yourself you can fully preserve quality by fine-tuning th...