SolarChat!

Valery

DeepSolar64 wrote: ↑Fri Oct 20, 2023 2:04 am I thought that might have been an AM5 mounted on the Losmandy tripod.

Ditto!

Valery.

Valery

Fantastic image, George!

Did you this photo intentionally to show the moon on the corona background?

Very unique photo! A 100% SPOD !

Valery

Valery

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...

Valery

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

Valery

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

Valery

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

Valery

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...

Valery · Re: Corona from 16 September 2023 Brilliant results, George! Fantastic! Valery

Brilliant results, George! Fantastic!

Valery

Valery

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...

Valery

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...

Valery

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...

Valery

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...

Valery

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

Valery

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

Valery

The very first picture (colorized) is very dramatic and well worth of APOD, IMHO. Such pictures are really rare.

Valery

Valery

Thanks, Stu! Excellent work. Much appreciated.

Valery

Valery

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...

Valery

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.

Valery

Nice image, Daniel!

Valery

Valery

Nice image, Daniel!

Valery

Valery

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 ...

Valery

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...

Valery

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...

Valery

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...

Valery

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).

Close to H-a.
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

Valery

Thanks, all. And thanks so much for posting the image! Valery, as Klaus said and as is also in that thread, we are probably near the limit. The big difference for me is that in H-alpha the chromosphere is helping you out by blocking 656nm light from the photosphere. That's why you can see filaments...

Valery

Fantastic results, George! Defenitely a SPOD, IMHO.

Great progress in corona imaging.

Do you think that such a filtering system is optimal and going narrower will not brings much of improvement?

Valery

Valery

Fantastic results, George! Defenitely a SPOD, IMHO.

Great progress in corona imaging.

Do you think that such a filtering system is optimal and going narrower will not brings much of improvement?

Valery

Valery

A new good step ahead in CaK with 9" scope!

Well worth of a SPOD.

Valery

Valery

A new good step ahead in CaK with 9" scope!

Well worth of a SPOD.

Valery

Valery

Very nice session, Pedro!

The seeing is a decided factor. It seems Portugal atlantic cost is blessed for good seeing.

Valery

Valery

Very nice session, Pedro!

The seeing is a decided factor. It seems Portugal atlantic cost is blessed for good seeing.

Valery

Valery

Excellent results.

Have you applied a Flat Field (FF) to these images?

Valery

Valery

When I use a DS, I always(!) see a huge difference between a SS and a DS modes.

Valery

Valery

Very nice! Thanks.

Valery

Valery

Nice, really nice image, Stephen! Very well balanced between disk and prominences.

I always impressed how well these old, pre-Meade, PSTs are performed.

I'd buy such a PST any day.

Valery

Valery

Petr, Here is GG's page https://www.flickr.com/photos/43926774@N06/ Valery Thanks for the link, Valery. I looked at the photos, but to be honest, it's not my cup of coffee. I was expecting something a little different. Petr Petr, I am glad to read that such photos are not for you. Giving this examp...

Valery

Petr,

Here is GG's page

https://www.flickr.com/photos/43926774@N06/

Valery

Valery

Nice resut. IME, you should increase the scale on the camera chip. Now the images look undersampled. So, some extra potential is here.

Valery

Valery

I use AviStack v2.0 and many years ago I observed how the program creates an image of many little pieces. At the moment, when I have Sun, I am using the smallest possible pieces and for a 904x904 pixel sized image I get around 15000 pieces. Need to check this and will confirm a bit later. According...

Valery

AR 8 is a clear winner.

Valery

marktownley wrote: ↑Tue Jun 27, 2023 6:43 pm What setup are you using?

Mark,

Is it possible to establish the rule that photos should consist the descroption of the setup they were taken with?

Vlery

Valery

Excellent series! The H-a is the best of the 3, IMHO.

Valery

Valery

Nice series of images, Christian! As always.

Valery

The main etalon is still the Daystar Quantum, double stacked with an LS35. I didn't knew about this. Seemed to me you do use a new etalon. This is the reason I asked about the imaging rig. The probability that DERF will be available again is quite slim. All what I can do is to sell the revived filt...

Valery

The main etalon is still the Daystar Quantum, double stacked with an LS35. I didn't knew about this. Seemed to me you do use a new etalon. This is the reason I asked about the imaging rig. The probability that DERF will be available again is quite slim. All what I can do is to sell the revived filt...

Valery

Fantastic results!

Thanks for sharing them with us.

Valery

Valery

Very nice series of images, Frank. IMO, the best your results so far.

I hope to see your further progress.

BTW We all don't know what setup were used.

Seems to me that you do use a new etalon.

Valery

Very nice series of images, Frank. IMO, the best your results so far.

I hope to see your further progress.

BTW We all don't know what setup were used.

Seems to me that you do use a new etalon.

Valery

Excellent results, Brian!

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