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by christian viladrich
Wed Jul 08, 2020 3:57 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 43
Views: 849

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

Here are some measurements we made : Version of Astronomik B filter previous the current one: http://astrosurf.com/viladrich/astro/instrument/filters/B-Astronomik-1-CV.JPG http://astrosurf.com/viladrich/astro/instrument/filters/B-Astronomik-2-CV.JPG Baader B CCD : http://astrosurf.com/viladrich/astr...
by christian viladrich
Wed Jul 08, 2020 1:17 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 43
Views: 849

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

Just for info, we have measured the transmission of a Baader B CCD filter last year with a photometer. We found 18% at 393.3 nm. The old B Astronomik filter has a transmission of 87% at 393 nm. This is the one as use as a 50 mm sub-apeture filter. Unfortunatly, the new version has a very low transmi...
by christian viladrich
Thu Jul 02, 2020 6:22 pm
Forum: This is SolarChat !!
Topic: The dynamics of sunspots
Replies: 19
Views: 302

Re: The dynamics of sunspots

I was wondering whether there could be some loss of resolution with the 640x480 video mode ?
by christian viladrich
Thu Jul 02, 2020 3:20 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 12 June 2020 Spectroheliograms
Replies: 11
Views: 284

Re: 12 June 2020 Spectroheliograms

These spectroheliograms are facinating ! Thanks for sharing.
Le CN line is interesting. We don't see a lot of CN images.
by christian viladrich
Thu Jul 02, 2020 3:15 pm
Forum: This is SolarChat !!
Topic: Ca K images taken on May 30 with the TOA150
Replies: 8
Views: 192

Re: Ca K images taken on May 30 with the TOA150

Thanks Jochen, Peter, Leo and Alexandra !
Leo, yes the gain was set to the minimum value.
by christian viladrich
Thu Jul 02, 2020 3:14 pm
Forum: This is SolarChat !!
Topic: Full disks in Ha and CaK 25th June '20
Replies: 21
Views: 257

Re: Full disks in Ha and CaK 25th June '20

Thanks Stu,
Some of the bright areas visible in Ca K are visible in Ha, other ... not.
by christian viladrich
Thu Jul 02, 2020 3:08 pm
Forum: This is SolarChat !!
Topic: The dynamics of sunspots
Replies: 19
Views: 302

Re: The dynamics of sunspots

It is very interesting ! This is great you were able to follow the evolution over some many days. Here is an image taken probably arround the same day as your frame #6. http://astrosurf.com/viladrich/astro/soleil/wl/2015/AR2396_12August2015-10h22mnUT-Gband.jpg We are missing these large sunspots ...
by christian viladrich
Mon Jun 29, 2020 6:12 pm
Forum: This is SolarChat !!
Topic: Full disks in Ha and CaK 25th June '20
Replies: 21
Views: 257

Re: Full disks in Ha and CaK 25th June '20

Beautiful FD, Stu.
I was wondering whether you could include an animation in order to compare easily the Ha and Ca K FD images ?
by christian viladrich
Mon Jun 29, 2020 6:06 pm
Forum: This is SolarChat !!
Topic: Solar prom animation, 06-27-20
Replies: 13
Views: 158

Re: Solar prom animation, 06-27-20

Beautiful !!
by christian viladrich
Mon Jun 29, 2020 6:06 pm
Forum: SPoD Archive
Topic: Solar prom animation, 06-27-20
Replies: 14
Views: 58

Re: Solar prom animation, 06-27-20

Beautiful !!
by christian viladrich
Mon Jun 29, 2020 6:03 pm
Forum: This is SolarChat !!
Topic: Sol from the 28th of June 2020.
Replies: 14
Views: 194

Re: Sol from the 28th of June 2020.

Hello Eric,
The full set of images is excellent. Well done !
by christian viladrich
Mon Jun 29, 2020 6:00 pm
Forum: This is SolarChat !!
Topic: Ca K images taken on May 30 with the TOA150
Replies: 8
Views: 192

Re: Ca K images taken on May 30 with the TOA150

Thanks Terry and Mark ! Mark, I started Ca K imaging a long time ago with a Vixen Fluorite 55 mm F/8 refractor. It was OK. Still, I found out lately that the AR coating vastly reduces its transmission in Ca K. Then, I used a Takahashi FSQ 106 (the old version). I had to stop it down to 80 mm. It was...
by christian viladrich
Mon Jun 29, 2020 5:51 pm
Forum: This is SolarChat !!
Topic: New AR approaching east limb
Replies: 5
Views: 93

Re: New AR approaching east limb

Thanks for the update.
by christian viladrich
Mon Jun 29, 2020 5:50 pm
Forum: This is SolarChat !!
Topic: Prominences June 28th, 2020
Replies: 12
Views: 178

Re: Prominences June 28th, 2020

Very nice Franco !
by christian viladrich
Mon Jun 29, 2020 3:46 pm
Forum: This is SolarChat !!
Topic: Ca K images taken on May 30 with the TOA150
Replies: 8
Views: 192

Ca K images taken on May 30 with the TOA150

I have been busy with my job and other stuff, so here are some old images taken on May 30. Nothing fancy, only a very small spot visible next to the solar limb : http://astrosurf.com/viladrich/astro/soleil/wl/2020/CaK-30May2020-10h15minUT-TOA150-Alluxa.jpg http://astrosurf.com/viladrich/astro/soleil...
by christian viladrich
Mon Jun 29, 2020 3:42 pm
Forum: Sunlit Earth
Topic: Noctilucent Clouds 22nd June 2020 02:12 UTC
Replies: 14
Views: 165

Re: Noctilucent Clouds 22nd June 2020 02:12 UTC

The animation is excellent !
by christian viladrich
Mon Jun 29, 2020 3:40 pm
Forum: Sunlit Earth
Topic: Reflecting on a sunrise
Replies: 15
Views: 146

Re: Reflecting on a sunrise

Wonderfull !!
by christian viladrich
Sun Jun 07, 2020 4:32 pm
Forum: This is SolarChat !!
Topic: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31
Replies: 27
Views: 452

Re: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31

For a 130-150 mm refractor, the standard Lunt module is quite good at a reasonable cost. But I am afraid this is not your question ...
I can't wait seeing the results of Alfred with his 0.15 nm.
by christian viladrich
Sun Jun 07, 2020 4:26 pm
Forum: This is SolarChat !!
Topic: AR12765 & prom with Solar Refr.228mm (bad seeing)
Replies: 11
Views: 183

Re: AR12765 & prom with Solar Refr.228mm (bad seeing)

Spectacular shots in spite of bad seeing Ale :-)
by christian viladrich
Sun Jun 07, 2020 4:25 pm
Forum: This is SolarChat !!
Topic: Active Region AR2765
Replies: 19
Views: 255

Re: Active Region AR2765

Very nice Stu.
At last, we are going to be treated with some activity for a few days :-)
by christian viladrich
Sat Jun 06, 2020 5:58 pm
Forum: This is SolarChat !!
Topic: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31
Replies: 27
Views: 452

Re: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31

Hi Mark,
You are perfectly right !
Generally speaking, and regarding Ca K or H, I would even discourage people to take a look at the eyepiece. This is more an observation to be made with a camera.
by christian viladrich
Fri Jun 05, 2020 8:57 am
Forum: This is SolarChat !!
Topic: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31
Replies: 27
Views: 452

Re: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31

Also, I would keep to a camera when using these type of filters. There no way that you would ever need 85%T, they should be used in the 5% range. There is a lot of UV light your dealing with. An important point here is that the goal is to use the filter on a 300 mm telescope with an uncoated primar...
by christian viladrich
Thu Jun 04, 2020 7:59 pm
Forum: This is SolarChat !!
Topic: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31
Replies: 27
Views: 452

Re: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31

Hi Chrisitian, Awesome images with the Alluxa filter!! I have placed an order for another version of CAK filter from Alluxa. It has the following specs: a. Gen3 single-cavity design, AR coating on S2 b. 393.37nm 1 angstrom (design) c. Measured FWHM - less or equal to 0.15nm d. Tpeak more than 85% I...