Search found 717 matches

by GreatAttractor
Thu May 13, 2021 9:42 pm
Forum: This is SolarChat !!
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 18
Views: 146

Re: My first Hα animation with D = 200 mm (and a flare)

Before an imaging session I check the news & warnings on Space Weather , also the recent few hours animation on GONG to see which AR has the tendency to flare. If I shoot from a location with good Internet access, I can also occasionally check GONG in real time (to see if e.g. I should slew to s...
by GreatAttractor
Thu May 13, 2021 8:32 pm
Forum: This is SolarChat !!
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 18
Views: 146

Re: My first Hα animation with D = 200 mm (and a flare)

Hi Florin, I took 15-second videos with 5-second breaks. Each video was then stacked and post-processed (sharpening and tone mapping), giving one frame of the animation. For smooth movement, the animation frames were aligned with ImPPG. In summary, here I used 20-second animation intervals (15+5), 4...
by GreatAttractor
Thu May 13, 2021 1:15 pm
Forum: This is SolarChat !!
Topic: 2021 May 12 - Random HA offerings
Replies: 16
Views: 118

Re: 2021 May 12 - Random HA offerings

Great results, and beautifully processed.
Can you remind me what's the Hɑ filter used?
by GreatAttractor
Thu May 13, 2021 8:08 am
Forum: This is SolarChat !!
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 18
Views: 146

Re: My first Hα animation with D = 200 mm (and a flare)

Thanks, everyone. Too bad seeing was deteriorating and clouds started rolling in – NOAA says 50 minutes later there was another flare in this AR, also C-class, but over twice as powerful.
Ivan wrote: Thu May 13, 2021 6:25 am Is this your new mod?
Yes, described here.
by GreatAttractor
Thu May 13, 2021 8:08 am
Forum: SPoD Archive
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 13
Views: 6

Re: My first Hα animation with D = 200 mm (and a flare)

Thanks, everyone. Too bad seeing was deteriorating and clouds started rolling in – NOAA says 50 minutes later there was another flare in this AR, also C-class, but over twice as powerful.
Ivan wrote: Thu May 13, 2021 6:25 am Is this your new mod?
Yes, described here.
by GreatAttractor
Wed May 12, 2021 8:05 pm
Forum: This is SolarChat !!
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 18
Views: 146

My first Hα animation with D = 200 mm (and a flare)

On Sunday the seeing was finally good enough to utilize my RC8 + LS50THa + Aried tri-band ERF setup. One of the best videos yielded this image of AR 2822 (check out this thread if you'd like to play with the raw stack): rc8_3m.png rc8_3.png I continued recording for some time, even though the seeing...
by GreatAttractor
Wed May 12, 2021 8:05 pm
Forum: SPoD Archive
Topic: My first Hα animation with D = 200 mm (and a flare)
Replies: 13
Views: 6

My first Hα animation with D = 200 mm (and a flare)

On Sunday the seeing was finally good enough to utilize my RC8 + LS50THa + Aried tri-band ERF setup. One of the best videos yielded this image of AR 2822 (check out this thread if you'd like to play with the raw stack): rc8_3m.png rc8_3.png I continued recording for some time, even though the seeing...
by GreatAttractor
Wed May 12, 2021 7:36 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 16
Views: 4326

Re: Lunt LS50THa modification to 200 mm aperture

Thank you, Valery. I've also posted the stack in this thread for people to try.
by GreatAttractor
Wed May 12, 2021 7:35 pm
Forum: Image Processing: Tips and Techniques
Topic: My first large-aperture Hα image – processing ideas
Replies: 2
Views: 41

My first large-aperture Hα image – processing ideas

On Sunday I finally caught seeing good enough to use my RC8 Lunt 50 mod. For anyone having any processing ideas, feel free to play with the sample stack and post your results (you can find Valery's in the mod's thread ): 200mm_ha_01_stack.tif I settled on using ImPPG's unsharp mask + tone correction...
by GreatAttractor
Tue May 11, 2021 7:48 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: How do I make an astronomy refractor a bird watching one?
Replies: 12
Views: 97

Re: How do I make an astronomy refractor a bird watching one?

I put the Canon on the telescope in a straight through position and everything is the right way up (from what I seem to remember at the eclipse). Took the Canon off and placed the eyepiece in and everything is upside down. So it is the Pentax Zoom which is upside down. Why is the eyepiece upside do...
by GreatAttractor
Tue May 11, 2021 7:32 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 90 mm aperture
Replies: 20
Views: 6784

Re: Lunt LS50THa modification to 90 mm aperture

I replaced the ailing Borg with 1.25" Feather Touch Crayford. It's excellent, works very smoothly, and covers the full focus range I need (no more adding/removing T2 extensions when switching to a Barlow).
fetouch.jpg
fetouch.jpg (401.82 KiB) Viewed 48 times
by GreatAttractor
Sun May 09, 2021 9:32 pm
Forum: Image Processing: Tips and Techniques
Topic: How to use Stackistry?
Replies: 3
Views: 37

Re: How to use Stackistry?

Keep in mind Stackistry is not yet very reliable. Works fine for my 90 mm Hα material (except sometimes for prominences), and usually for CaK and WL in good seeing, otherwise it's a hit-or-miss. 3) Can you just stack the frames you select in the Video window (I would deselect all of them, and only s...
by GreatAttractor
Sun May 09, 2021 8:56 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 16
Views: 4326

Re: Lunt LS50THa modification to 200 mm aperture

I had good seeing today (as in: immediately in live view I could tell "this is it"; fine structures were easily visible). It tooks some time, but I can confirm the mod works: rc8_result_m.png rc8_result.png No thermal issues after all, I didn't need to run the cooling fan (though I did lea...
by GreatAttractor
Fri May 07, 2021 10:27 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 16
Views: 4326

Re: Lunt LS50THa modification to 200 mm aperture

I captured quite a lot of material on April 23; it looked quite promising in live view, alas, the seeing just wasn't good enough. Stacking went fine (this time the RC was carefully collimated), but when it came to sharpening, the lowest sensible σ of L–R deconvolution was around 2.36, i.e. around 2x...
by GreatAttractor
Wed May 05, 2021 8:07 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Problem with Lunt 50
Replies: 46
Views: 557

Re: Problem with Lunt 50

To me it seems to be the etalon sweetspot - which is normal. The bright areas are those just outside the sweet-spots's edge. The Lunt 50 is capable of showing the whole solar disc on-band, and it does that more or less in your images. It's just that the center of the sweet-spot is a bit to the right...
by GreatAttractor
Tue May 04, 2021 3:36 pm
Forum: Solar Software
Topic: ImPPG version 0.6.3
Replies: 14
Views: 407

Re: ImPPG version 0.6.3

1) Can you specify LRD separately from unsharp masking ? I mean I would like to do one with out necessarily doing the other. 2) Can you include a histogram display feature ? I think having a histogram would be advantageous. I hope you can do this for the next update !! Done and done ;) 1) Both can ...
by GreatAttractor
Sat May 01, 2021 5:04 pm
Forum: This is SolarChat !!
Topic: Goodbye Active Regions
Replies: 20
Views: 288

Re: Goodbye Active Regions

That's a great image and animation. What setup do you use?
by GreatAttractor
Fri Apr 30, 2021 12:36 pm
Forum: This is SolarChat !!
Topic: Swirling prominence and other animations from Sunday
Replies: 20
Views: 249

Re: Swirling prominence and other animations from Sunday

Thanks! I have a particulary bright specimen of B600 (from my old Lunt 35; by exposure times, it was ~4x brighter than a B1200 I had borrowed for tests once), so I keep gain = 0. For the Hα surface videos the shutter time was 0.67 ms (histogram filled in about 75-80%) and 7.3 ms for the prominences ...
by GreatAttractor
Thu Apr 29, 2021 9:28 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarSpectrum?
Replies: 29
Views: 748

Re: SolarSpectrum?

I got interested in SolarSpectrum filters myself for a potential future (...as in: distant) upgrade, and I found among other things this thread on CN where Mark Wagner from SS himself answers some questions. In summary, for temperature control they use a thermoelectric heater/cooler (TEC) (except th...
by GreatAttractor
Thu Apr 29, 2021 6:43 pm
Forum: This is SolarChat !!
Topic: Swirling prominence and other animations from Sunday
Replies: 20
Views: 249

Re: Swirling prominence and other animations from Sunday

Thank you, everyone.

That second prominence is the most spectacular thing I've caught in Hα so far.
by GreatAttractor
Wed Apr 28, 2021 9:14 pm
Forum: This is SolarChat !!
Topic: 27Apr: Spectacular active zone in Ca-K
Replies: 15
Views: 222

Re: 27Apr: Spectacular active zone in Ca-K

I love the level of details! I'm curious, what's the pixel pitch on your camera? I'd like to compare with mine and with my focal ratio I use with 90 mm.
by GreatAttractor
Wed Apr 28, 2021 8:34 pm
Forum: Solar Scope Modifications
Topic: Thread on etalon Lunt 50
Replies: 4
Views: 112

Re: Thread on etalon Lunt 50

1. It's fine. If the F-number is slightly smaller, the input beam is a bit too wide and gets truncated, therefore the effective aperture is reduced; but 6.9 vs. 7 doesn't make much difference. 2. I suspect the difference between cameras is down to measurement error. If you're sure it's real and you ...
by GreatAttractor
Wed Apr 28, 2021 6:07 pm
Forum: Forum Support Issues
Topic: Problem posting a topic with multiple image links
Replies: 1
Views: 176

Problem posting a topic with multiple image links

Hi team, I had trouble with my topic here: https://solarchatforum.com/viewtopic.php?f=4&t=31649&p=290231#p290231 It only has a single JPG attached, all other images are inline links to Astrobin. I was unable to create a single post with all of them (the rest of the post would get truncated a...
by GreatAttractor
Wed Apr 28, 2021 6:04 pm
Forum: SPoD Archive
Topic: Swirling prominence and other animations from Sunday
Replies: 13
Views: 101

Re: Swirling prominence and other animations from Sunday

Interesting little sparks in the lower sunspot, but according to NOAA there were no flares there at the time. Everything captured with PGR Chameleon 3 mono (ICX445), processed with Stackistry, AviStack 2, ImPPG & GIMP. Hα: 90/660 mm refractor + Lunt 50 etalon, Barlow 1.6x. CaK: 90/660 mm refract...
by GreatAttractor
Wed Apr 28, 2021 6:04 pm
Forum: This is SolarChat !!
Topic: Swirling prominence and other animations from Sunday
Replies: 20
Views: 249

Re: Swirling prominence and other animations from Sunday

Interesting little sparks in the lower sunspot, but according to NOAA there were no flares there at the time. Everything captured with PGR Chameleon 3 mono (ICX445), processed with Stackistry, AviStack 2, ImPPG & GIMP. Hα: 90/660 mm refractor + Lunt 50 etalon, Barlow 1.6x. CaK: 90/660 mm refract...