Search found 160 matches

by Bruce G
Sat Nov 21, 2020 9:33 pm
Forum: This is SolarChat !!
Topic: New roll-off-roof
Replies: 42
Views: 535

Re: New roll-off-roof

Great work.
We're all envious - but looking forward to more of your excellent images

Bruce G
by Bruce G
Sat Nov 21, 2020 8:32 pm
Forum: This is SolarChat !!
Topic: The first moving picture
Replies: 1
Views: 46

The first moving picture

Something I just learned today: Predating Muybridge's work by 4 years, the first moving picture was a series of images of a solar transit by Venus in 1874, credited to Pierre Jules César Janssen and produced using a camera specially built for the purpose, called a "photographic revolver." https://ww...
by Bruce G
Mon Oct 05, 2020 1:26 am
Forum: This is SolarChat !!
Topic: September 26, 12773 H-a closeup 04 Oct. updated
Replies: 25
Views: 574

Re: September 26, 12773 H-a closeup

Wonderful images
Thank you

Bruce G
by Bruce G
Sat Oct 03, 2020 9:19 pm
Forum: This is SolarChat !!
Topic: AR2773 10/01/2020 with fantastic filament
Replies: 19
Views: 387

Re: AR2773 10/01/2020 with fantastic filament

Very nice. Excellent detail
by Bruce G
Sun Sep 27, 2020 1:04 am
Forum: SPoD Archive
Topic: AR2773 on 20230_09_25 with decent seeing through thin haze
Replies: 5
Views: 124

AR2773 on 20230_09_25 with decent seeing through thin haze

Finally some OK seeing around these parts. The last time I had good seeing was with a thin overcast too. I'm wondering if there is a relationship

Lunt LS80, single stack
TeleVue 5x Powermate
ZWO ASI174MM
AR2773 2020_09_25a.jpg
AR2773 2020_09_25a.jpg (692.65 KiB) Viewed 160 times
AR2773 2020_09_25 colored1.jpg
AR2773 2020_09_25 colored1.jpg (801.89 KiB) Viewed 160 times
by Bruce G
Sun Sep 27, 2020 1:04 am
Forum: This is SolarChat !!
Topic: AR2773 on 20230_09_25 with decent seeing through thin haze
Replies: 5
Views: 171

AR2773 on 20230_09_25 with decent seeing through thin haze

Finally some OK seeing around these parts. The last time I had good seeing was with a thin overcast too. I'm wondering if there is a relationship

Lunt LS80, single stack
TeleVue 5x Powermate
ZWO ASI174MM
AR2773 2020_09_25a.jpg
AR2773 2020_09_25a.jpg (692.65 KiB) Viewed 171 times
AR2773 2020_09_25 colored1.jpg
AR2773 2020_09_25 colored1.jpg (801.89 KiB) Viewed 171 times
by Bruce G
Sat Sep 26, 2020 11:47 pm
Forum: SPoD Archive
Topic: Imaging from home (T300 Solar newton, K-Line
Replies: 16
Views: 263

Re: Imaging from home (T300 Solar newton, K-Line

Very nice granulation in your images. Well done!

Bruce G
by Bruce G
Sat Sep 26, 2020 11:47 pm
Forum: This is SolarChat !!
Topic: Imaging from home (T300 Solar newton, K-Line
Replies: 19
Views: 399

Re: Imaging from home (T300 Solar newton, K-Line

Very nice granulation in your images. Well done!

Bruce G
by Bruce G
Thu Sep 24, 2020 12:19 am
Forum: SPoD Archive
Topic: H-alpha Sun 2020-9-23
Replies: 10
Views: 139

Re: H-alpha Sun 2020-9-23

Splendid detail in that shot!

Bruce G
by Bruce G
Thu Sep 24, 2020 12:19 am
Forum: This is SolarChat !!
Topic: H-alpha Sun 2020-9-23
Replies: 14
Views: 353

Re: H-alpha Sun 2020-9-23

Splendid detail in that shot!

Bruce G
by Bruce G
Sun Sep 20, 2020 7:27 pm
Forum: This is SolarChat !!
Topic: Having trouble tuning Lunt LS80MT Double Stack
Replies: 14
Views: 264

Re: Having trouble tuning Lunt LS80MT Double Stack

Andrew, That's a fine image. There's simply nothing much to see up there right now. As soon as we get even a decent filament I think you'll see the difference. I'll second the suggestion of going single stack for a bit. But if the Sun perks up, you have clear skies and good seeing, you'll definitely...
by Bruce G
Sun Sep 20, 2020 12:49 am
Forum: This is SolarChat !!
Topic: Sun up close. 1.5m GREGOR telescope.
Replies: 12
Views: 363

Re: Sun up close. 1.5m GREGOR telescope.

Fantastic animation. I get mesmerized by those things. What are we seeing at 430 nm? This is apparently the CH G band. I found this: "Whereas the main source of line opacity in the solar atmosphere is atomic lines, the solar spectrum also contains several strong molecular features. The most prominen...
by Bruce G
Sun Sep 20, 2020 12:00 am
Forum: This is SolarChat !!
Topic: Having trouble tuning Lunt LS80MT Double Stack
Replies: 14
Views: 264

Re: Having trouble tuning Lunt LS80MT Double Stack

Is this the configuration that you're using? If so, you don't have the drawtube adjusted properly. As Terry suggested, get the camera out of the system and work visually at first until you're sure you have everything right. Adding the second etalon will indeed change the focus, since you change the ...
by Bruce G
Fri Sep 11, 2020 1:36 pm
Forum: This is SolarChat !!
Topic: Competition Winner- Alexandra
Replies: 37
Views: 809

Re: Competition Winner- Alexandra

Congratulations Alexandra!

Nice to see you too

Bruce G
by Bruce G
Thu Sep 10, 2020 7:51 pm
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 395

Re: How much pressure is in a pressure tuned etalon? And more

Ralston ( https://www.ralstoninst.com/calibration-test-pumps ) makes a precision hand pump that can do pressure, vacuum, or both, with both coarse and fine tuning adjustment. I use it on my vacuum-tuned internal etalon: https://solarchatforum.com/viewtopic.php?f=10&t=15443&start=75#p196348 Sweet! I...
by Bruce G
Thu Sep 10, 2020 7:23 pm
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 395

Re: How much pressure is in a pressure tuned etalon? And more

Bob, Excellent! The plot tells me everything that I need to know. Where did you find that? I was looking for detailed information on the etalons, but never got much past marketing info or general descriptions. Rod, I like your suggestion of the two stage adjustment. Did you notice that the cap is qu...
by Bruce G
Thu Sep 10, 2020 1:06 am
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 395

Re: How much pressure is in a pressure tuned etalon? And more

Brian Thank you. That helps a lot. There must be more internal volume in there than is apparent. A lower pressure makes everything a whole lot easier. I kind of wonder what would get overpressured above 25 psi. Internal components are solid, so a pressure differential appears only at the end seals a...
by Bruce G
Wed Sep 09, 2020 6:27 pm
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 395

Re: How much pressure is in a pressure tuned etalon? And more

Thanks. I've already disassembled to that level. What I need to know is what the inside of the sealed part looks like.

The videos do illustrate the pieces of hardware that I'm talking about very nicely though, so that is helpful
by Bruce G
Wed Sep 09, 2020 5:54 pm
Forum: This is SolarChat !!
Topic: How much pressure is in a pressure tuned etalon? And more
Replies: 16
Views: 395

How much pressure is in a pressure tuned etalon? And more

I could find only one other thread on the site that mentioned this and it seems to have ended shortly after the subject was brought up. I thought I would try to put some numbers to the question and what I found surprised me. I ask anyone who is interested in the subject to please help check my calcu...
by Bruce G
Mon Aug 31, 2020 3:43 pm
Forum: This is SolarChat !!
Topic: Lunt LS80 storage temp range
Replies: 10
Views: 349

Re: Lunt LS80 storage temp range

"I received my Lunt 60 mm last winter and quickly learned that cold temps degrade performance. "

Dan, could you be more specific please? What sort of degradation did you observe? I live in northern Michigan and it gets pretty cold here too. What should I be looking for?

Thanks

Bruce G
by Bruce G
Wed Aug 26, 2020 1:52 pm
Forum: Sunlit Earth
Topic: Landscapes and critters
Replies: 14
Views: 422

Re: Landscapes and critters

Gorgeous - and I love damselflies and dragonflies!

Thanks
by Bruce G
Wed Aug 19, 2020 1:03 am
Forum: This is SolarChat !!
Topic: Does this appear to be overprocessed?
Replies: 14
Views: 396

Re: Does this appear to be overprocessed?

Rainer,

I'm afraid I don't have my own Dropbox. It's $20 a month for files this large and I just don't send that many files

Sorry

Bruce G
by Bruce G
Tue Aug 11, 2020 5:35 pm
Forum: This is SolarChat !!
Topic: Does this appear to be overprocessed?
Replies: 14
Views: 396

Re: Does this appear to be overprocessed?

tusted - The sand grains, or dots, from the Lucy-Richardson method are a reason I was looking at a different deconvolution method. Regarding the quality of posted images - what they do to my images on Facebook when I post them for friends is almost criminal. I want to cry sometimes and have even res...
by Bruce G
Tue Aug 11, 2020 3:08 am
Forum: This is SolarChat !!
Topic: Does this appear to be overprocessed?
Replies: 14
Views: 396

Re: Does this appear to be overprocessed?

Thanks for your comments folks. ammonthenephite and Astrophil - Yes, you're seeing what I'm talking about. Interesting that you should mention Topaz products, ammonthenephite. I used Topaz Gigapixel AI for the deconvolution. Aside from that though, it's all contrast and brightness adjustments in Pho...
by Bruce G
Mon Aug 10, 2020 11:36 pm
Forum: This is SolarChat !!
Topic: Does this appear to be overprocessed?
Replies: 14
Views: 396

Does this appear to be overprocessed?

I was working on some images of our little spot. The seeing was pretty poor, as is often the case for my location, but I was trying to squeeze out detail and I got to a point where nothing looks right to me now. Is the finer detail here merely processing artifacts? Please enlarge the image to full s...