SolarChat!

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 :-)

christian viladrich

Thanks guys :-) Pretty impressive closeups with the Mewlon, Christian. What is the focal length to get to F/35 ? 8750 mm ? Franco My mistake Franco, the f-ratio is 32. The focal length is 8100 mm with the 2.7x Airylab telecentric. Sill, I've never actually measure it. I've got the old Mewlon 250 mm ...

christian viladrich

Thanks Mark !

The 9 microns pixels of the IMX462 are perfect at f/35. Still, the maximum fps is a bit low. The same sensor at 155 fps/s would be great.

christian viladrich

Hi, Here are two images taken on September 27 with the Mewlon 250, Baader 290 mm D-ERF and a double-stack Ha combination : http://astrosurf.com/viladrich/astro/soleil/wl/2023/2023-09-27-1102-ChrVldr-AR3435-M250-Ha.jpg http://astrosurf.com/viladrich/astro/soleil/wl/2023/2023-09-27-1021-ChrVldr-AR3445...

christian viladrich

This is splendid !! We can see some kind of "granulation wave" going radially outward from the two main spots (in particular the buttom one). Not sure I ever seen anything like this. Can you make a BW slower animation ? This one is nice for the spots and penombra, but a bit fast for granul...

christian viladrich

Welcome to the group Ala ! This is splendid.

The Zeiss is quite a beautifull refractor, and the Ca K filter looks quite good.

christian viladrich

Thanks to all !! These are just stunning, Christian ! Probably some of your best, in my opinion. Never saw so much detail in CaK. These are definitely reference images. Indeed Franco, when I start processing these images I had quite a shock. This is for sure my best Ca K images. The type of activity...

christian viladrich

Thanks to all !! These are just stunning, Christian ! Probably some of your best, in my opinion. Never saw so much detail in CaK. These are definitely reference images. Indeed Franco, when I start processing these images I had quite a shock. This is for sure my best Ca K images. The type of activity...

christian viladrich

Hi, I had completely forgotten about these images. So, it was a very nice surprise to have a look at them. The seeing was great. It's the type of conditions when I say to myself that the Taka TOA 150mm TOA is really too small. I need something definitely bigger for Ca K. I had tuned all the Alluxa C...

christian viladrich

Hi, I had completely forgotten about these images. So, it was a very nice surprise to have a look at them. The seeing was great. It's the type of conditions when I say to myself that the Taka TOA 150mm TOA is really too small. I need something definitely bigger for Ca K. I had tuned all the Ca K fil...

christian viladrich

Thanks guys :-)

christian viladrich

Simon2940 wrote: ↑Fri Dec 08, 2023 10:31 pm Here you go!

POSITIVE by Simon Tang, on Flickr

christian viladrich wrote: ↑Fri Dec 08, 2023 12:46 pm Very nice Simon !

Do you have the same not inverted ?

Thanks !

We also see the rotation of the Sun :-)

christian viladrich

This is a big one. Well done !

christian viladrich

This is a big one. Well done !

christian viladrich

Hi , Here is the triple-stack system I use : http://astrosurf.com/viladrich/astro/instrument/intrumentCaK/Tilt-mount-TS.jpg http://astrosurf.com/viladrich/astro/instrument/intrumentCaK/Tilt-mount-TS-b.jpg The top one was done by a mechanist. Unfortunately, he does no longer work for amateurs. So, I ...

christian viladrich

Hello Alfred, Have you tilted the Alluxa filters ? As you know, they are not right on Ca K center, so you need to tilt them. This being said, resolution is quite good. Hi Christian, I expected and can see the resolution improvement in this CAK system from Apollo. Thank you for your question. This p...

christian viladrich

Very interesting design. Well done !
The possibility of focussing internally both collimating and imaging lenses is really nice.
On top of that, it makes the whole spectro much more rigid.

christian viladrich

Hi, Here is a set of images taken in Ca K on September 9, 24 and 25. The first one is a mistake...I forget to put the 75 mm aperture stop on the Taka TOA 150. So, the f-ratio was f/7.3, instead of f/14.6, which resulted in a great loss on contrast : http://astrosurf.com/viladrich/astro/soleil/FD/202...

christian viladrich · Re: Almost an X Class 11/28/2023 Great capture Warren !

Great capture Warren !

christian viladrich

Hi Sergio,
What is the f-ratio of your Rumak ?
Seeing is much worse in near-UV, so it might be worth trying again in near-UV with better seeing.

christian viladrich

Very nice Simon !

Do you have the same not inverted ?

christian viladrich · Re: Massive prom lifting off, 07 Dec 2023 Beautifull !

Beautifull !

christian viladrich

Hello Alfred,
Have you tilted the Alluxa filters ? As you know, they are not right on Ca K center, so you need to tilt them.
This being said, resolution is quite good.

christian viladrich

Thanks guys ! Doug, The images are representative of the minimum values. Indeed, the sampling of my SSM is about 1 value every 0.6 s. The Basler 1920-155 runs at 160 fps. So, 30 successive frames (my usual stack) represents a duration of less than 0.2 s. So, basically, the SSM does not capture what ...

christian viladrich

Hi all, Without any measuring equipement, or at least any possibility of comparison with other filters, it is extremely difficult to get an idea of the quality of an Halpha solar filter. This is specially true for people observing away from any associations or other solar observers. This summer, I...

christian viladrich

Presumably the telecentric/culminated section in the middle eats up some of that horizontal distance and widens the cone. That back of the envelope calculation also doesn't account for vignetting, all of which pushes the blocking filter closer to the sensor, but I don't know how much closer. Hi, Th...

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