SolarChat!

christian viladrich

Excellent George ! The Ha version is amazing. Only a coronagraph can have such a detectivity away from the solar limb. I was wondering if the IMX 533 from Player One could be worth considering. It has a huge dynamic range, much larger than the ASI1600. But this would be only beneficial to Ha images,...

christian viladrich

Very nice images Arne !

christian viladrich · Re: 8 March 2024 Splendid ! There are penombral waves visible on all spots :-)

Splendid !
There are penombral waves visible on all spots :-)

christian viladrich

Some nice action visible there.
Thanks for sharing Arne !

christian viladrich

Nice shots Dave !

christian viladrich

Hi, Here is set of images taken on March 7 with various filters from the continuum at 540 nm to Ca K. Baader 540 nm is a nice all arround filter. Facular plages are visible close to the solar limb : http://astrosurf.com/viladrich/astro/soleil/FD/2024/2024-03-07-1158-ChrVldr-540nm.jpg With the Altair...

christian viladrich

Hi Christian, The peak transmission of the filters is between 50-60%. This particular one is 56%. Have you been told what the peak transmission of the Solarspectrum Ca-K is? That would be a really exciting possibility. Laszlo Hi Laszlo, This is quite good considering the low altitude of the Sun. Wh...

christian viladrich

Hi Laszlo,
This is quite good considering the low altitude of the Sun.
What is the peak transmission of your 0.37 nm filter ?

christian viladrich

Simple but effective. Well done !

These 3D printers are great :-)

christian viladrich

Looks good to me :-)

christian viladrich

The 850 nm is very interesting since it shows plages accross the solar disk, a bit as a very low contrast Ca II IR filter.
Well done !

It would be interesting to compare this 850 nm filter to a G-band filter or a 393-3 nm (if you have one of these filters).

Thanks for sharing !

christian viladrich

ust to come in from a tangent here and play devils advocate: Why do you need to denoise an image in the first place? My question would be where is the source of the noise? If it is stacking then more frames are needed, if it is in post processing then the source of noise is oversharpening either th...

christian viladrich

Splendid Mark !

The FD and the close-up images are great. The proms turn out very well !

I still have to do more tests to check if is better to take specific (longer) exposures for the proms, or not.

It could be that these current proms are very bright in Ca K.

christian viladrich

Thanks guys :-)

The filter is indeed an Altair 393-3 nm (and not an Antlia 393-3 nm). I guess Altair will soon provide information.

christian viladrich

Well done Alfred ! The respaced C6 is doing good in Ca K.

christian viladrich

Well done Alfred ! The respaced C6 is doing good in Ca K.

christian viladrich

Very nice animation. Well done !

christian viladrich

Hi, Unexpected clearing this morning, and turbulence was quite low considering the low height of the Sun. I was good time give the Altair 393-3 nm its first light : http://astrosurf.com/viladrich/astro/soleil/FD/2024/2024-02-23-1109-ChrVldr-Altair393-3nm-IMX533.jpg The funny thing is that with this ...

christian viladrich · Re: Full Disc 09-02-2024 Great shot Rainer ! This spot is impressive.

Great shot Rainer !

This spot is impressive.

christian viladrich

I don't think a double stack BF will help. I've done some simulations to test the idea some times ago, but 1 nm is way too large. It makes no difference. There is some benefits of double-stacking starting at about 2 A filter (and of course below). So, practically it means double stacking with a Lunt...

christian viladrich

blindqvist wrote: ↑Tue Jan 30, 2024 10:21 am When can i order the new Tilt-adapter from RAF, or can i already do it ? Does anybody know that ? Best regards, Bengt

Hi Bengt,

Just send a send to Raf :
https://rafcamera.com/contact/

I hope to have mine (I've ordered three units) in a few weeks (including delivery delay).

christian viladrich

Splendid Peter !

christian viladrich

Thanks for the news !

It would be nice to have something like this (including CME) at next total solar eclipse ;-)

christian viladrich

Awesome ! Very well done. Thanks for sharing.

christian viladrich

Interesting. I would have thought a 5a design would be quite easy to do with filters alone. Given that the Quark Ca H is thermo-regulated, it is most probable that it is a mica-spaced etalon. On top of that the DayStar Quantum Ca K (or H) 2 A and 5 A filters are mica-spaced etalons. So the mica use...

christian viladrich

Since it is a 5A filter it will remain at 5A at its best i would say. I read the initial question too fast. The curve from DayStar DayStar is for 0.5 A Ha filters, so I thouch the question was about 0.5 A Ha Quark ... As said by Dennis, at f/30-40, a 5 A Ca K filter will have an effective FWHM of 5...

christian viladrich

Hi, For information, a tilt mount will be available soon from RAF camera. Here is a picture of the prototype : http://astrosurf.com/viladrich/astro/instrument/intrumentCaK/RAF-camera-tilt-mount.jpg The final version will be anodized and have other type of knobs. There is a M42x0.75 mm thread on both...

christian viladrich

What size is your Barlow lens ?
As long as the light beam does not touch the metal body of the Barlow, there is no issue.
In orther words, you can use : refractor > Barlow lens > Lunt Ca K with no problem if the light beam passes only through the lens of the Barlow and does not touch its body.

christian viladrich

I am sorry to say this curve from DayStar white paper is completely wrong. It is impossible to have a material (mica, fused silica, or whatever) giving a curve like this. The best possible fit is to have an index of 1.96 for the etalon gap, which is very far from the 1.65 index of mica. See more in ...

christian viladrich

Thanks guys !! Very good Christian! The 462 seems to have handled the high gain well. This year, I will try higher gain values in order to get shorter exposure times. I don't know yet where is the sweet spot. What is the central obstruction on the Mewlon scope? It isn't as large as a RC or SCT if I ...

christian viladrich

Hi,

The 5x Barlow is really too much. You should use a 3x instead, in order to have a f/30 ratio, which is fine given the pixel size of the IMX174.

The, you will have more light which, in combination to using an exposure time around 4-5 ms, will allow to use a much lower gain.

christian viladrich

Hi, Here are some old Ha images taken last year with the Mewlon 250 and a double-stack configuration on Sept 10 and August 14. This image of the solar limb gives a nice 3D effect of the apparent surface of the chromosphere : http://astrosurf.com/viladrich/astro/soleil/wl/2023/2023-09-10-1044-ChrVldr...

christian viladrich

Spectacular images Petr !

As James I was wondering where you were gone, or maybe you had bad weather.

I hope things will get better as fast as possible. Take care.

Christian

christian viladrich

Exciting news Bob !

I wonder what is the peak transmission of these filters. Do you have any data on this ?

christian viladrich

The graphs taken from http://www.astrosurf.com/viladrich/astro/instrument/solar/FP-Daystar.htm say that a double stack 0.6 has about the same or slightly wider FWHM than a single 0.3, but flatter tails to let in less of the far off-band continuum (so might even perform better). http://www.astrosurf...

christian viladrich

I would want to be able to do close-up feature images and cropping is just a waste of all that equipment. Hi, I am no sure what you mean by this. Are you considering a third option, in addition to the two options you've described above : - Option 1 : Lunt 60mm front etalon > Askar FRA500 > TZ-4 > S...

christian viladrich

Askar FRA500 is a 500mm focal length petzval. Just for the record, a Petzval is made of two doublets. So, the FRA 500 is definitely not a Peztval given it is a triplet + doublet. On top of that, Askar placed a patent on the design, which won't be possible if if was a Petzval. On the other hand, the...

christian viladrich

Now here's the next question I need to solve. I'm asking it as a continuation of this thread rather than a new thread because it still comes down to whether it's better to use a front etalon in front, or in back. (I'm including the explainers for anyone who is new to the hobby). Option 1 listed fro...

christian viladrich

This is splendid ! Processing is perfect. Well done !

christian viladrich

This is splendid ! Processing is perfect. Well done !

christian viladrich

Hi Michael,
Just wondering what is your exposure time and gain value with the continuum ?

christian viladrich

Very nice umbral waves. Well done Ralph !

christian viladrich

Hi, A word of caution there. I know what is a "solar flare". I know what is a "coronal mass ejection". But I've never heard about a "flare ejection". So my suggestion would be to stick to usual solar nomenclature. In particular if there is any solar astronomer in the ju...

christian viladrich

Hi Warren,
I hope your eye issue can be fixed, or heals soon.
BTW, nice pic and animations !

christian viladrich

Hello Alfred,
The processing of the last image is quite good !

You need to tune the 0.1 nm filter right on Ca K to have some detection of the fibrils. Do you have a tilt mount ?

Is it simple-stack or double-stack ?

christian viladrich

Dear Christian Villarich： The image is great! Seeing your single/double filter comparison chart, it indicates that CAK，CAH Spices on the disk have been detected. What is the required filter bandwidth< 1A, can a single filter be used? Thank you for your reply Alex Hi Alex, Fibrils becomes more or le...

christian viladrich

Thanks guys, and thanks for the SPOD :-)

christian viladrich

marktownley wrote: ↑Tue Dec 12, 2023 7:37 pm Where did you order them from if you don't mind Michael?

An updated and improved printed version is available from here :
https://azur3dprintshop.com/9-solex-base.html

The optical parts are available from here :
https://www.shelyak.com/produit/kit-opt ... x/?lang=en

christian viladrich

Hi, Nice remix of the Sol'ex! The first results are great :) I'm curious about the slit used. On your github I saw this: "Glass slit: slit width 7 microns, slit length 13mm, 16 * 10mm, thickness 2mm" Where can I buy this type of narrow slit ? I was wondering whether it would be better to ...

christian viladrich

Montana wrote: ↑Tue Dec 12, 2023 9:59 am All your images are breath taking, but the Calcium, well, speechless

Alexandra

Indeed, with the double-stack 1 A filters, the calcium images are something :-)

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