Search found 150 matches

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: 117

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: 212

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: 117

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: 417

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: 176

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: 176

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: 176

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: 176

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: 176

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: 7
Views: 120

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: 258

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: 291

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: 291

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: 291

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: 291

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...
by Bruce G
Thu Jul 23, 2020 2:56 pm
Forum: This is SolarChat !!
Topic: AR2767 - A little better than expected 2020_07_22
Replies: 4
Views: 219

AR2767 - A little better than expected 2020_07_22

The seeing was poor to fair and there was 75% cloud cover. But it was cumulus and I could sneak in a few frames between clouds. "Few", being the operative word. I normally capture sequences of 1000 frames using seeing-based capture. In this imaging session there was no time to wait for the seeing-ba...
by Bruce G
Wed Jul 22, 2020 9:55 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200722) | AR12767 (GOOD seeing)
Replies: 11
Views: 438

Re: Today's SUN (20200722) | AR12767 (GOOD seeing)

Very nice Pedro.
Great detail for being on the limb.
by Bruce G
Mon Jul 20, 2020 2:23 am
Forum: This is SolarChat !!
Topic: July 15 sun in fast mode
Replies: 12
Views: 397

Re: July 15 sun in fast mode

Some great detail on those spicules and wispy prominences
by Bruce G
Tue Jul 07, 2020 11:51 pm
Forum: This is SolarChat !!
Topic: New video and a FD
Replies: 5
Views: 205

Re: New video and a FD

Very nice video. Thank you
by Bruce G
Tue Jul 07, 2020 4:54 pm
Forum: This is SolarChat !!
Topic: Good seeing on 6 July
Replies: 11
Views: 296

Re: Good seeing on 6 July

Thanks Mark. I have a 2.5x barlow that makes the Sun fill the sensor of the QHY, but there is no room at all for drift or prominences of any respectable size. A 2x would be perfect. I bought a 2x TeleVue a while back, but it's not built to adapt to a camera like the 2.5x and 5x are and I haven't loo...
by Bruce G
Tue Jul 07, 2020 2:55 pm
Forum: This is SolarChat !!
Topic: Good seeing on 6 July
Replies: 11
Views: 296

Re: Good seeing on 6 July

Thanks folks Here is a comparison of images (from 2017) made by the two cameras, about an hour apart, displayed at the same pixel scale for comparison. I didn't put much effort into the images, so this is more about the raw size of the image that each camera gives me to work with. Still, the benefit...
by Bruce G
Tue Jul 07, 2020 3:13 am
Forum: This is SolarChat !!
Topic: Good seeing on 6 July
Replies: 11
Views: 296

Good seeing on 6 July

Some actual good seeing for once. There was a haze in the sky, but it was fairly uniform. I got out the QHY camera which has a higher pixel density than my ZWO, but has a much slower frame rate, 1/10 of the ZWO. I usually can't use it under normal conditions because I can't focus the scope with the ...
by Bruce G
Sun Jun 28, 2020 10:19 pm
Forum: SPoD Archive
Topic: Solar prom animation, 06-27-20
Replies: 14
Views: 325

Re: Solar prom animation, 06-27-20

Wow! That's great!
by Bruce G
Sun Jun 28, 2020 10:19 pm
Forum: This is SolarChat !!
Topic: Solar prom animation, 06-27-20
Replies: 13
Views: 336

Re: Solar prom animation, 06-27-20

Wow! That's great!