Search found 4059 matches
- Wed Jan 03, 2024 5:01 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
I think, Valery, that you are wrong that I am looking for some arguments for Soley. On the contrary, I have the feeling that you are looking for arguments against it from the beginning. It should be noted that there are not hundreds of thousands of C14 owners. It's not a cheap telescope. Those who ...
- Sun Dec 31, 2023 2:37 am
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
I feel, Valery, that no one here disputes the theoretical fact that the angular resolution increases with the diameter of the mirror. But as usual, the theory applies to the ideal state, but in practice other factors are applied that influence the result. Agreed. No one doubts the resolution apertu...
- Sun Dec 31, 2023 2:06 am
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
1. Why would anyone go to the trouble of making a mirror with L/16 if they could get the same image with L/2? 2. The quality of the resulting image is limited by the theoretical resolution, but this does not mean that every telescope meets it. 3. I've seen solar photos from the TAK 150mm which hand...
- Sat Dec 30, 2023 3:17 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
We are aware of the outstanding capabilities of our telescope, and for other solar photographers, we are enthusiastically and experimentally building the best-optimised outstanding telescope for solar photography. Any your efforts will not change physics. Larger aperture has higher angular resoluti...
- Sat Dec 30, 2023 3:11 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
Laszlo, Can you, please, note for youself, that SCT telescope can be EASILY corrected in violet and UV spectral range? Is this so difficult to remember? Just like newtonians are corrected for coma with comacorrected barlow, with the same easy SCT can be corrected for coma and SA in violet and UV. So...
- Sat Dec 30, 2023 3:05 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
It is important to highlight that if you want to compare the image quality of telescopes, you do so at the same image processing level. In this pair of images there is no post-processing noise filtering (in either image), so you can see how much advantage solar newtons have over a non-solar telesco...
- Sat Dec 30, 2023 2:21 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
As for the SCT, unfortunately there are several parameters that do not allow the photo below to be taken with it easily or at all. One of these parameters is shown in the graph below, which displays that the Strehl in blue degrades extremely quickly on the C14. source: http://www.astrosurf.com/vila...
- Sat Dec 30, 2023 2:10 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
1. Why are off-axis Newtons built when you think central obstruction improves resolution? 2. I won't dispute the statement that the best possible C14 will be better than the best N300, but for mass production it is not so certain. 1. Central obstruction increases CONTRAST ON HIGHER SPATIAL FREQUENC...
- Sat Dec 30, 2023 1:49 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
It's a nice comparison, Valery, but it says nothing about the quality of the Newton's mirrors and collimation. It just shows that this particular N300 performed worse than the C14. Yes, it performs worser because of it's smaller diameter. And all other 300mm telescopes will perform worser due to th...
- Sat Dec 30, 2023 12:07 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
Yes. Soleye must be of 14" diameter to be equal to a C14 in angular resolution.DeepSolar64 wrote: ↑Sat Dec 30, 2023 6:30 am Those C14 images are awesome also!!
Maybe a 14" SolEye would be a possibility?
Valery
- Fri Dec 29, 2023 8:27 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
I don't care about the contrast, Valery. I vividly remember the increase in resolution and detail when I swapped out the 42mm L/6 secondary mirror on the N180/F7 for a 33mm L/20. Even a blind person would know the difference. I think the optics on the N300 can be purchased in much better quality th...
- Thu Dec 28, 2023 12:18 am
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
Never. Aperture rules. Larger central obstruction makes contrast on highest spatial frequencies higher vs smaller c.o.
- Wed Dec 27, 2023 4:28 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
A comparison between the two scopes (C14 - solar newton) was made by Christian Viladrich himself formely in 2018, when they captured the Sun from the same place at the same time with Thierry Leagult. It is really interesting and useful to read this thread: https://solarchatforum.com/viewtopic.php?t...
- Tue Dec 26, 2023 10:40 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
I think it's a great opportunity to discuss a hidden difficulty and potential of solar photography. However, I must add, I did not want to speak against a certain type of telescope. I read by my own eyes that you wrote that this telescope - Soleye 300 achieved better resolution than 356mm C14. You ...
- Tue Dec 26, 2023 6:12 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
"The Soleye 300 is fully capable of hi-res Ca-K photography which means it also achieves higher resolutions than the C14. "(С) What about the laws of physics? Are they no longer valid? Or maybe this is a typo and you meant the C11 scope? If not a typo, solid poofs required. Valery Hi Vale...
- Tue Dec 26, 2023 12:44 pm
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
Can you clarify a bit? Which country or countries did you mean? Thanks, Valery I don't know the conditions in other countries, so I'm writing about the Czech Republic, where I live. In various areas of interest, forums are created around which the community is centered. If such a forum is controlle...
- Tue Dec 26, 2023 3:04 am
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
Petr,
Can you clarify a bit? Which country or countries did you mean?
Thanks,
Valery
- Tue Dec 26, 2023 2:36 am
- Forum: This is SolarChat !!
- Topic: new Hi-res photospheric telescope
- Replies: 76
- Views: 5830
Re: new Hi-res photospheric telescope
"The Soleye 300 is fully capable of hi-res Ca-K photography which means it also achieves higher resolutions than the C14. "(С)
What about the laws of physics? Are they no longer valid? Or maybe this is a typo and you meant the C11 scope?
If not a typo, solid poofs required.
Valery
What about the laws of physics? Are they no longer valid? Or maybe this is a typo and you meant the C11 scope?
If not a typo, solid poofs required.
Valery
- Sun Dec 24, 2023 6:12 pm
- Forum: This is SolarChat !!
- Topic: New Solar Prediction Update and Experimental Display
- Replies: 10
- Views: 951
Re: New Solar Prediction Update and Experimental Display
Thank you very much, Bob.
Valery
Valery
- Wed Nov 15, 2023 9:18 am
- Forum: This is SolarChat !!
- Topic: Looking for opinion on corona processing
- Replies: 15
- Views: 951
Re: Looking for opinion on corona processing
Took a next look at them and now #2 is the best for me.
- Mon Nov 13, 2023 9:39 am
- Forum: This is SolarChat !!
- Topic: Saturday Sunshine 11th November
- Replies: 21
- Views: 1102
Re: Saturday Sunshine 11th November
Mark,
I believe that at least a 100mm for the Ha line can be used for larger scale with the same success.
Other than this, the works are great.
Valery
I believe that at least a 100mm for the Ha line can be used for larger scale with the same success.
Other than this, the works are great.
Valery
- Mon Nov 13, 2023 9:33 am
- Forum: This is SolarChat !!
- Topic: Looking for opinion on corona processing
- Replies: 15
- Views: 951
Re: Looking for opinion on corona processing
#4 - best for my monitor and eyes/brain.
- Tue Nov 07, 2023 1:53 pm
- Forum: This is SolarChat !!
- Topic: Solar details H-a 06.11.
- Replies: 11
- Views: 568
- Sun Oct 22, 2023 3:38 pm
- Forum: This is SolarChat !!
- Topic: David and Goliath - ISTAR 9"/F9 and Sollar scout DSII40mm
- Replies: 20
- Views: 2756
Re: David and Goliath - ISTAR 9"/F9 and Sollar scout DSII40mm
Just to chime in on my experience with an ISTAR 150mm f/10. I had it independently tested. I won’t bore you with the details, but in summary it has ~ 1/5 PV coma at full aperture (it is advertised as a minimum of 1/4 wave) , and is ~ 1/10 wave at 120mm. Essentially no astigmatism. It is “well polis...
- Fri Oct 20, 2023 5:31 am
- Forum: Annular Solar Eclipse October 14 2023
- Topic: Montage of Moon approaching Sun in front of corona
- Replies: 24
- Views: 4350
Re: Montage of Moon approaching Sun in front of corona
George, for me your series of images is a SPOY! Yes, SPOY!
Valery
Valery
- Fri Oct 20, 2023 5:03 am
- Forum: Annular Solar Eclipse October 14 2023
- Topic: Montage of Moon approaching Sun in front of corona
- Replies: 24
- Views: 4350
Re: Montage of Moon approaching Sun in front of corona
Ditto!DeepSolar64 wrote: ↑Fri Oct 20, 2023 2:04 am I thought that might have been an AM5 mounted on the Losmandy tripod.
Valery.
- Mon Oct 16, 2023 6:04 am
- Forum: Annular Solar Eclipse October 14 2023
- Topic: Moon approaching Sun over corona before first contact
- Replies: 17
- Views: 2821
Re: Moon approaching Sun over corona before first contact
Fantastic image, George!
Did you this photo intentionally to show the moon on the corona background?
Very unique photo! A 100% SPOD !
Valery
Did you this photo intentionally to show the moon on the corona background?
Very unique photo! A 100% SPOD !
Valery
- Sun Oct 15, 2023 7:05 pm
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Measurement of a very good Quark
- Replies: 4
- Views: 1760
Re: Measurement of a very good Quark
You are completely right Valery ! Good would mean : - narrow FWHM, - good uniformity of the CWL (assuming that if we have uniformity of the CWL, we also have uniformity of the FWHM ...), - a good transmission (to keep exposure short). I measure FWHM only at the center of the filter. I have indicati...
- Thu Oct 12, 2023 4:55 pm
- Forum: Solar Radio, Magnetometry and Spectroscopy
- Topic: Sol’Ex Spectroheliograph first light (FS60C F/5.9) | (20231012)
- Replies: 19
- Views: 2745
Re: Sol’Ex Spectroheliograph first light (FS60C F/5.9) | (20231012)
Excellent debute in the SHG league, Pedro! Congratulates!
BTW. I believe with Portugal excellent seeing, in the future, the minimum of aperture should be 150mm. Correct?
Looking for many more images from you.
Valery
BTW. I believe with Portugal excellent seeing, in the future, the minimum of aperture should be 150mm. Correct?
Looking for many more images from you.
Valery
- Thu Sep 21, 2023 11:15 pm
- Forum: SPoD Archive
- Topic: H-alpha and Ca-H -- SHG close up images, 21 Sept
- Replies: 7
- Views: 816
Re: H-alpha and Ca-H -- SHG close up images, 21 Sept
Fantastic! Congratulates, Doug!
Fibrills are significantly better seen in Ca-H vs Ca-K.
A lot of similarities between Ha and Ca-H pictures.
Should be in SPOD.
Valery
Fibrills are significantly better seen in Ca-H vs Ca-K.
A lot of similarities between Ha and Ca-H pictures.
Should be in SPOD.
Valery
- Thu Sep 21, 2023 11:15 pm
- Forum: This is SolarChat !!
- Topic: H-alpha and Ca-H -- SHG close up images, 21 Sept
- Replies: 16
- Views: 1236
Re: H-alpha and Ca-H -- SHG close up images, 21 Sept
Fantastic! Congratulates, Doug!
Fibrills are significantly better seen in Ca-H vs Ca-K.
A lot of similarities between Ha and Ca-H pictures.
Should be in SPOD.
Valery
Fibrills are significantly better seen in Ca-H vs Ca-K.
A lot of similarities between Ha and Ca-H pictures.
Should be in SPOD.
Valery
- Wed Sep 20, 2023 8:33 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Reducers for 393nm Wavelength?
- Replies: 7
- Views: 1219
Re: Reducers for 393nm Wavelength?
I asked Baader about using the RG 0.4 and 0.7 focal reducers intended to be used for the TZ3 focal reducers. They responded: "We actually haven't tried it out yet, as a reducer usually is not necessary for the CaK-filter (which operates at the native f/ratio of the tellescope), and the SolarSp...
- Mon Sep 18, 2023 1:21 am
- Forum: This is SolarChat !!
- Topic: Corona from 16 September 2023
- Replies: 8
- Views: 356
Re: Corona from 16 September 2023
Brilliant results, George! Fantastic!
Valery
Valery
- Fri Sep 15, 2023 10:04 am
- Forum: SPoD Archive
- Topic: First attempt with a Ca K 1 A filter and a 300 mm Newtonian
- Replies: 16
- Views: 1309
Re: First attempt with a Ca K 1 A filter and a 300 mm Newtonian
Maybe the SHG is equivalent to a triple-stack 1 A combination. Just a guess ... If at 0.1A filter you do mean the filter made of Apollo's batch, then no, Christian, they are not an equivalent of the 0.2A SHG. Even quad stack of them is FAR not equivalent. I saw images of quad stack. You need a doub...
- Fri Sep 15, 2023 10:04 am
- Forum: This is SolarChat !!
- Topic: First attempt with a Ca K 1 A filter and a 300 mm Newtonian
- Replies: 25
- Views: 2475
Re: First attempt with a Ca K 1 A filter and a 300 mm Newtonian
Maybe the SHG is equivalent to a triple-stack 1 A combination. Just a guess ... If at 1A filter you do mean the filter made out of Apollo's batch, then no, Christian, they are not an equivalent of the 0.2A SHG. Even quad stack of them is FAR not equivalent. I saw images of quad stack of these filte...
- Thu Sep 14, 2023 4:17 am
- Forum: This is SolarChat !!
- Topic: First light with new toy - iStar Asteria TCR 204-12 R35
- Replies: 27
- Views: 1413
Re: First light with new toy - iStar Asteria TCR 204-12 R35
I wish I would have bought a Chromacor when they were available new. Now they are hard to find. They would really help my 102mm achromat, especially at night. Baader does make two filters to reduce chromatic aberration. Their Fringe Killer and the Semi-Apo filters. They screw into the eyepiece or d...
- Tue Sep 12, 2023 2:25 pm
- Forum: This is SolarChat !!
- Topic: First light with new toy - iStar Asteria TCR 204-12 R35
- Replies: 27
- Views: 1413
Re: First light with new toy - iStar Asteria TCR 204-12 R35
Thank you very much Dennis, Mark, James, Petr, Clare Peter, Franco, Vin, Christian and Simon for all your kind comments! Mark: With the Losmandy dovetail, which is quite heavy, it weighs in at 22kg. Then comes ERF, filter and camera, so it's definetely pushing the weight limits of the AM5. Then the...
- Sun Sep 10, 2023 11:02 am
- Forum: This is SolarChat !!
- Topic: AR210/F9 and best seeing of this year 09.09.
- Replies: 11
- Views: 634
Re: AR210/F9 and best seeing of this year 09.09.
Photos # 1, 4, 8, 9 are truly amazing. They took a well deserved place in my collection of H-a solar images taken by other amateurs with 8" apertures. Excellent seeing is at least 2/3 of the job. And 8-9/10 of the job in CaK.
Thanks for sharing, Petr.
Valery
Thanks for sharing, Petr.
Valery
- Thu Sep 07, 2023 7:14 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Measurement of a very good Quark
- Replies: 4
- Views: 1760
Re: Measurement of a very good Quark
Very interesting, Christian.
Any images of the sun with this Quark?
Telling "good Quark", what did you mean - the Quark is very uniform, the Quark is narrow enough, or the Quarl is a very uniform and narrow enough?
Valery
Any images of the sun with this Quark?
Telling "good Quark", what did you mean - the Quark is very uniform, the Quark is narrow enough, or the Quarl is a very uniform and narrow enough?
Valery
- Thu Sep 07, 2023 6:57 am
- Forum: This is SolarChat !!
- Topic: One wild prominence and a few details 05.09.
- Replies: 6
- Views: 357
Re: One wild prominence and a few details 05.09.
The very first picture (colorized) is very dramatic and well worth of APOD, IMHO. Such pictures are really rare.
Valery
Valery
- Sun Aug 27, 2023 5:55 am
- Forum: This is SolarChat !!
- Topic: Cycle 25 progression
- Replies: 26
- Views: 1973
Re: Cycle 25 progression
Thanks, Stu! Excellent work. Much appreciated.
Valery
Valery
- Wed Aug 23, 2023 4:53 am
- Forum: This is SolarChat !!
- Topic: Some closeups of todays sun in Ca-K
- Replies: 15
- Views: 640
Re: Some closeups of todays sun in Ca-K
Oh my!!!!!! almost professional :bow :bow :bow Alexandra Images are indeed very good. Just need a bit better seeing, IMHO. But you can do the same or even better if you will use the same imaging train as Dennis did. You have a telescope which is 11" and so, potentially it can deliver even bett...
- Wed Aug 23, 2023 4:46 am
- Forum: This is SolarChat !!
- Topic: Coronado BF30 - diagonal not needed? & BF preservation?
- Replies: 5
- Views: 404
Re: Coronado BF30 - diagonal not needed? & BF preservation?
Use this equipment as written on it: telescope with both etalons --> internal BF --> diagonal with a red filter. This all.
In your case internal BF + red glass diagonal = complete BF.
In your case internal BF + red glass diagonal = complete BF.
- Wed Aug 23, 2023 4:30 am
- Forum: SPoD Archive
- Topic: WL AR 3504
- Replies: 10
- Views: 1180
Re: WL AR 3504
Nice image, Daniel!
Valery
Valery
- Wed Aug 23, 2023 4:30 am
- Forum: This is SolarChat !!
- Topic: WL AR 3504
- Replies: 12
- Views: 543
Re: WL AR 3504
Nice image, Daniel!
Valery
Valery
- Sat Aug 19, 2023 8:06 am
- Forum: This is SolarChat !!
- Topic: My woes with a Solar full disk in H-a 16.08.
- Replies: 20
- Views: 948
Re: My woes with a Solar full disk in H-a 16.08.
Hey Petr, when you are recording are you using neutral gamma on the camera? I have no idea what it is. Teach me. I finally got the IMX178 today so I tried FD with it. It looks like this chip will be perfect for my telescope. This image is really better (uniformity wise) than the first one. However ...
- Thu Aug 17, 2023 6:49 am
- Forum: This is SolarChat !!
- Topic: My woes with a Solar full disk in H-a 16.08.
- Replies: 20
- Views: 948
Re: My woes with a Solar full disk in H-a 16.08.
The only really good DS of FD images I saw, all were taken with both etalons external. All other combinations more or less suffer of contrast and brightness nonuniformity. Best of them were done by Bob Yoesly with his two SM90 pre-Meade selected and precisely clocked. Quarks have their own vignettin...
- Sat Aug 05, 2023 11:15 pm
- Forum: This is SolarChat !!
- Topic: Solar corona from August 1
- Replies: 31
- Views: 1886
Re: Solar corona from August 1
Valery, thanks. I am limiting my aperture to the following extent. Many thanks, George. PS. If memory serves me well, I remember that B. Liot has used the touth of skin fat from the side of the nose and polished the lens with a piece of lint-free flannel. Honestly, I can't imagine how this helped L...
- Sat Aug 05, 2023 6:18 am
- Forum: This is SolarChat !!
- Topic: Solar corona from August 1
- Replies: 31
- Views: 1886
Re: Solar corona from August 1
Hi, Valery. I may very well have it wrong, but let me explain what I am saying more clearly and see what you and others think. Hi George, Clear enough. I forgot about the fact that coatings are a very strong source of a light scattering. My fault. OK, we need to work behind the occulting disk. To k...
- Fri Aug 04, 2023 8:19 pm
- Forum: This is SolarChat !!
- Topic: Solar corona from August 1
- Replies: 31
- Views: 1886
Re: Solar corona from August 1
Close to H-a.christian viladrich wrote: ↑Fri Aug 04, 2023 6:15 pm Not sure if this is relevant to the discussion, but the FWHM of the Fe XIV line is about 0.9 A (source : S. Koutchmy CNRS/IAP).
Should be enough for imaging of a 1 degree circle if the filter is about 0.7A FWHM and mounted in a front of the objective.
Valery