SolarChat!

christian viladrich

Hi Kevin, The blue Astronomik filter has a diameter of 50 mm. It is used as a sub-aperture ERF : http://astrosurf.com/viladrich/astro/instrument/intrumentCaK/Montage-CaK-Barr-Alluxa-Astronomik.jpg Because the Alluxa 0.1 nm is transparent to UV, green, red and IR, it requires the use of a complementa...

christian viladrich

Has anyone ever tried to make this change? If you mean has anyone tried a "naked" PST etalon in a telecentric beam, the answer is yes, a number of people have done this. For example, I tested an excellent PST etalon on a C8 EdgeHD at f/28. Its FWHM was about 0.34 A at f/115 and 0.9 A at f...

christian viladrich

Same as Dennis ;-)

And never use "auto something".

christian viladrich · Re: 30 March 2024 AR3615 Ca K Splendid Leo !

Splendid Leo !

christian viladrich · Re: 30 March 2024 AR3615 Ca K Splendid Leo !

Splendid Leo !

christian viladrich

Any links to images or experience with one of these? Hi David, Have a look here : http://astrosurf.com/viladrich/astro/soleil/wl/2023/soleil_hr_2023.html or here : http://astrosurf.com/viladrich/astro/soleil/FD/2023/soleil2023.htm Most of my Ca K images are made with the alluxa 0.1 nm filter (singl...

christian viladrich

Sure, you can use a PST etalon in telecentric beam. But as it is an air-spaced etalon, you need a larger f-ratio. Here is the effective FWHM of mica-spaced etalon according to the f-ratio : http://astrosurf.com/viladrich/astro/instrument/solar/Julia-FWHMres-f-ratio-15-50-mica-spaced.jpg f/28 to 32 i...

christian viladrich

Looks ready for the eclipse !

christian viladrich

The difference of visibility of the facular plages between the G-band and the 685 nm is quite unexpected.
Any chance you mixed the filters ? Or variation in sky conditions ?

christian viladrich

Fantastic shots Laszlo, and the Sun is still rather low.

Are you still observing near a lake ?

christian viladrich

Fantastic shots Laszlo, and the Sun is still rather low.

Are you still observing near a lake ?

christian viladrich · Re: 24.03.24 big prom& spot The image of the flare is splendid. Well done !

The image of the flare is splendid. Well done !

christian viladrich

Hi,
The filter is said "out of stock", but it is now listed in Alluxa catalog, which is good news :-)

https://alluxa.com/optical-filter-catal ... ss-filter/

christian viladrich

As general rule, when you buy new stuff, weather turns bad.

Still, I have not bought any thing new for a while, and weather is bad down here :-(

christian viladrich

Hi Denis, Just wondering whether your could try a respaced 150 mm refractor, just like Alfred did. This would significantly increase the resolution of your Ca K images. The C9.25 is the best version of SC for blue light. Still, it is not diffraction limited at 393 nm. There is no doubt about it. htt...

christian viladrich

Sounds good ;-)

I am planning to use a ZWO FF 80/600 with a Nikon Z7. So, same focal length with a full-frame camera. I run exposure times from 1/250 s to 1 s during totality.

christian viladrich

The image is great! 1、Alluxa 0.14 nm + 0.37 nm image K1 or K2? 2、How much bandwidth is required to see CAK Fibers on that disk? Thank you for your reply! Thanks !! The Alluxa 0.14 nm + 0.37 nm combination is still rather "large", which means we have both Ca K 3 (=center of Ca K line) and ...

christian viladrich

Very fine. Well done Nic !

christian viladrich

Very fine. Well done Nic !

christian viladrich

Very nice animation. Well done !

christian viladrich

Very nice animation. Well done !

christian viladrich

I found another good granulation image in Calcium-K from the same session: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizwaw2XvLWBQBn9t4WMWp3VuP62Yn399yWNIWxoOwMeN5L5m5IpCTnb4c-mNXv6RnEibAgjuReG31OG-urv2On7ih5lfFMDXMZt3fFw8spawEPFr2s4EAuXPet2BIen6mqylqYENEliJsMw2k2ltAIuUOw8Fg3KCUMsJz...

christian viladrich

Thanks guys ! Nice set and comparison Christian, is a triple stack (2x Alluxa 0.14 nm + 0.37 nm) possible with the TOA? Yes, for example here : http://astrosurf.com/viladrich/astro/soleil/wl/2023/2023-09-26-1214-ChrVldr-AR3438-CaK-TS.jpg For FD images, the difference between triple stack (0.37 nm + ...

christian viladrich

That's a very nice comparison! Is this the Alluxa filter you have? https://alluxa.com/optical-filter-catalog/ultra-narrow-bandpass/393-44-0-37-od6-ultra-narrow-bandpass/ Kevin Yes Kevin, this is the 0.37 nm filter. The other Alluxa filter (the 0.14 nm) was a group order organized by an amateur who ...

christian viladrich

Thanks guys !!

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...

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