New CaK etalons from Solar Spectrum

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New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

It's now official.

Solar Spectrum has announced the availability of CaK etalon filter systems with FWHM's less than 1 Angstrom.

K Line Solar Spectrum SM.png
K Line Solar Spectrum SM.png (170.85 KiB) Viewed 2773 times
Solar Spectrum.


Due to the limitations of even the most modern interference filter hard-layer depositing, reliable CWL uniformity and bandpasses below 1.5 A have been essentially unobtainable, and just as with H alpha, CaK etalons offer the only filter technology that can reliably achieve sub-angstrom performance and high angular resolution.

While there is the availability of DayStar K line etalons, like the rest of DayStar's current offerings, the Quarks seem problematic as far as CWL and uniformity, and their better quality CaK Quantums are insanely priced: ~$18,000 USD for a 2.0 A FWHM. :shock:

While I don't know the exact prices, Mark said his CaK filters will be similarly priced to his H alpha offerings, which in reality makes him the only affordable source for a quality < 1 A CaK optical filter system.

Mine's ordered :D

Bob


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Re: New CaK etalons from Solar Spectrum

Post by marktownley »

That's exciting! I hope he has a lot of them :D


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Re: New CaK etalons from Solar Spectrum

Post by christian viladrich »

Exciting news Bob !

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


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Re: New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

Hi Christian,

I'll have to make an inquiry with Mark, not sure he has a cleaved piece of mica yet. It will be an ~ 0.5 A RG18 etalon in a Housing I have left over from a previous 2 A DayStar CaK T Scanner (and possibly heated if not TEC controlled). It has hard coated blockers from Alluxa.

I'll post an answer when I hear back.


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

marktownley wrote: Wed Jan 03, 2024 3:53 pm That's exciting! I hope he has a lot of them :D
While I don’t know how many systems he has on hand I know he sourced a few different sized blocking filters for future orders. With Mark, you have to be patient. I have been waiting for over a year (now that he has sourced a lot of the materials wait time should be shorter) and emails are not answered right away but I know it’s going to be a quality product and the price is reasonable.


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Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

Interesting. Hopefully the design is done in mind for 100% imaging and according light throughput for the blockers and polarizers. Otherwise im out.


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Re: New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

Hi Dennis,

I'm confused by the statement "hopefully the design is done in mind for 100% imaging." Do you mean as opposed to visual? Camera sensors are generally much more sensitive than retinas with yellowed eyeball lenses, so that would seem to imply you want less throughput for the blockers and polarizers.

However, these filters incorporate new hard-coated Alluxa blockers with a very high ~ 80% transmission. Additionally, Mark has received some very transparent uncolored mica that makes - in combination with the high T blockers - the less than 1 Angstrom bandpasses practical.

My original DayStar ATM 0.7 A filter from 1976 had such a muscovite mica, and the view was brighter and more uniform than almost any I viewed through since. I really regret having sold it. That's why I'm getting one of these etalons now before that mica becomes less available via incorporation into the Baader / Solar Spectrum H alpha filters. Who knows when more of this high-quality mica will become available again. None will likely be coming out of Russia for quite some time, and that coming out from India and elsewhere is reportedly hit or miss.

Bob


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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

Bob Yoesle wrote: Thu Jan 04, 2024 6:58 pm Hi Dennis,

I'm confused by the statement "hopefully the design is done in mind for 100% imaging." Do you mean as opposed to visual? Camera sensors are generally much more sensitive than retinas with yellowed eyeball lenses, so that would seem to imply you want less throughput for the blockers and polarizers.

However, these filters incorporate new hard-coated Alluxa blockers with a very high ~ 80% transmission. Additionally, Mark has received some very transparent uncolored mica that makes - in combination with the high T blockers - the less than 1 Angstrom bandpasses practical.

My original DayStar ATM 0.7 A filter from 1976 had such a muscovite mica, and the view was brighter and more uniform than almost any I viewed through since. I really regret having sold it. That's why I'm getting one of these etalons now before that mica becomes less available via incorporation into the Baader / Solar Spectrum H alpha filters. Who knows when more of this high-quality mica will become available again. None will likely be coming out of Russia for quite some time, and that coming out from India and elsewhere is reportedly hit or miss.

Bob

Hi Bob,

what i meant was that i hope that the transmission of the system is as high as possible and not compromized (by design) for to make it safe for visual use.
80% for the blockers sounds already very good. Info about the aproximate absolute system transmission will be of help to determine exposure times / signal strength for imaging purposes. Yes, the camera sensors are more sensitive then the human eye, but it doesnt tell me if i can saturate the pixel full well of a certain sensor in a good time.

Apart of this i think this is exciting news and im sure it will be a fine product.

Dennis
Last edited by Dennis on Fri Jan 05, 2024 12:46 pm, edited 1 time in total.


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by Ljungmann »

I can confirm the very high transmission in my 0.3Å SS filter. Amazing views! My old Del Woods 0.6Å ATM filter (Quantum house now) has an extremely high transmission. Probably a good old high quality clear/light Muscovite. If I compare a newer SE 0.4Å filter and my 0.3Å filter, The SE filter have a low and "boring" transmission. Looks like 50% of the transmission of my SS filter. Looking forward to the new CaK filters.


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Re: New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

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

Per Mark:

"The ones we checked went from 15% to 5% . This was caused by the difference in shade of the mica. With all mica, the darker it is the lower T and broader Hw with the same coating design. With the high T blockers, I'm thinking there won't be that much difference in transmission than a Ha filter. Outside from the fact that we can't see k-line. So visibly, it may seem dimmer... We are using a UV Polaroid with a wave plate to make a circular Polaroid. So that's the same as an Ha filter."


Bob


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Re: New CaK etalons from Solar Spectrum

Post by galaxie427 »

Bob Yoesle wrote: Thu Jan 04, 2024 6:58 pm However, these filters incorporate new hard-coated Alluxa blockers with a very high ~ 80% transmission. Additionally, Mark has received some very transparent uncolored mica that makes - in combination with the high T blockers - the less than 1 Angstrom bandpasses practical.

My original DayStar ATM 0.7 A filter from 1976 had such a muscovite mica, and the view was brighter and more uniform than almost any I viewed through since. I really regret having sold it. That's why I'm getting one of these etalons now before that mica becomes less available via incorporation into the Baader / Solar Spectrum H alpha filters. Who knows when more of this high-quality mica will become available again. None will likely be coming out of Russia for quite some time, and that coming out from India and elsewhere is reportedly hit or miss.

Bob
Thanks Bob for posting this new offering from Mark Wagner and I just want to say that the above insights you shared are also much appreciated.
I'm glad I saw your post since I was considering Mark's CaK filters a while back and now must move forward. :D

Thanks again,
Luka


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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

5%-15% is a good value, thx for the info.


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H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Just got an update from Mark, my filter is complete and awaiting testing. Of course, he is dealing with lots of rain. My weather hasn’t been favorable either but spring is coming! I have fingers crossed to have it by the end of the month. :D


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Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Fri Feb 09, 2024 6:58 pm Just got an update from Mark, my filter is complete and awaiting testing. Of course, he is dealing with lots of rain. My weather hasn’t been favorable either but spring is coming! I have fingers crossed to have it by the end of the month. :D
Lucky you, i didnt even get a reply to my email 4 weeks ago, asking how much one would be :lol:


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Dennis wrote: Fri Feb 09, 2024 8:24 pm
hopskipson wrote: Fri Feb 09, 2024 6:58 pm Just got an update from Mark, my filter is complete and awaiting testing. Of course, he is dealing with lots of rain. My weather hasn’t been favorable either but spring is coming! I have fingers crossed to have it by the end of the month. :D
Lucky you, i didnt even get a reply to my email 4 weeks ago, asking how much one would be :lol:
Hopefully you won’t have to wait over a year for delivery like me. Try to pm him here or send him another email.
According to Mark they will be similarly priced to the RG H-alpha filters but don’t quote me on that.


James
These pretzels are making me thirsty! (C.C.)
The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Fri Feb 09, 2024 10:44 pm
Dennis wrote: Fri Feb 09, 2024 8:24 pm
hopskipson wrote: Fri Feb 09, 2024 6:58 pm Just got an update from Mark, my filter is complete and awaiting testing. Of course, he is dealing with lots of rain. My weather hasn’t been favorable either but spring is coming! I have fingers crossed to have it by the end of the month. :D
Lucky you, i didnt even get a reply to my email 4 weeks ago, asking how much one would be :lol:
Hopefully you won’t have to wait over a year for delivery like me. Try to pm him here or send him another email.
According to Mark they will be similarly priced to the RG H-alpha filters but don’t quote me on that.
well that would be just too long for me : )
i was just curious, so you yourself dont know the price yet for yours?


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by DavidP »

You might contact Bob at Alpine Astronomical about availability


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

DavidP wrote: Mon Feb 12, 2024 3:02 am You might contact Bob at Alpine Astronomical about availability
When I tried to order my H-alpha directly from Mark, he didn’t respond to my email until about a month after I ordered it from Alpine. So it took mark about 6 weeks to respond. The H-alpha took a little over the 12 weeks I was quoted for delivery. The price at that time was $3500 plus $400 for the telecentric and the cost of shipping. It was about a third of what Daystar had listed for a similar filter.


James
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The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
Coming Soon: Solar Spectrum CaK II <1A filter
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Tue Feb 13, 2024 5:18 pm
DavidP wrote: Mon Feb 12, 2024 3:02 am You might contact Bob at Alpine Astronomical about availability
When I tried to order my H-alpha directly from Mark, he didn’t respond to my email until about a month after I ordered it from Alpine. So it took mark about 6 weeks to respond. The H-alpha took a little over the 12 weeks I was quoted for delivery. The price at that time was $3500 plus $400 for the telecentric and the cost of shipping. It was about a third of what Daystar had listed for a similar filter.

Thanks for the info.


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by GeorgeIonas »

Good to hear that Mark as some clear mica. My order for a 0.3 angstrom Ha filter placed through Alpine Astro is coming up to 2 years of wait time.


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

GeorgeIonas wrote: Sun Feb 18, 2024 8:34 am Good to hear that Mark as some clear mica. My order for a 0.3 angstrom Ha filter placed through Alpine Astro is coming up to 2 years of wait time.
Ouch! That’s a little concerning.


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Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

I know Mark had some production issues with a coating machine needing parts and the like. And he refused to turn out products that ultimately would end up coming right back. Sometimes you just have to bite the bullet and wait - try an Astro-Physics refractor for example, where the wait time is also usually measured in many years. While not perfect, these companies generally emphasize quality vs. quantity.

On the other hand, you can roll the dice on quantity over quality - and may pay the price in the end.


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

I got a call from Mark today! The filter is ready but his weather has been very bad for testing. So if you know anybody in Chico, please have them dance for sun and stop dancing for rain! 😉😁


James
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The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

I wish I could report that I have been testing the filter out but as of today I have no idea of what is going on with the filter. I talked to Mark on 2/27 and he said it was ready for testing but his weather was making it difficult. I emailed him 3 weeks later, 2 weeks after that, another week later and last week but he hasn’t responded.

Has anyone heard from him lately or placed an order? I know he’s done this before and eventually he responds but from the phone call I got, I thought it was almost ready for shipping.


James
These pretzels are making me thirsty! (C.C.)
The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
Coming Soon: Solar Spectrum CaK II <1A filter
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Fri Apr 12, 2024 3:06 am I wish I could report that I have been testing the filter out but as of today I have no idea of what is going on with the filter. I talked to Mark on 2/27 and he said it was ready for testing but his weather was making it difficult. I emailed him 3 weeks later, 2 weeks after that, another week later and last week but he hasn’t responded.

Has anyone heard from him lately or placed an order? I know he’s done this before and eventually he responds but from the phone call I got, I thought it was almost ready for shipping.

With new products you never know.. might have not passed his final quality/performance check, but i hope for the best.


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Dennis wrote: Sun Apr 14, 2024 12:13 pm
hopskipson wrote: Fri Apr 12, 2024 3:06 am I wish I could report that I have been testing the filter out but as of today I have no idea of what is going on with the filter. I talked to Mark on 2/27 and he said it was ready for testing but his weather was making it difficult. I emailed him 3 weeks later, 2 weeks after that, another week later and last week but he hasn’t responded.

Has anyone heard from him lately or placed an order? I know he’s done this before and eventually he responds but from the phone call I got, I thought it was almost ready for shipping.

With new products you never know.. might have not passed his final quality/performance check, but i hope for the best.
Yeah I get that but a simple reply to one of my emails over a month and a half is not that much to ask. I don’t mind waiting it’s the lack of communication that makes me feel uncomfortable. Or am I being unreasonable?


James
These pretzels are making me thirsty! (C.C.)
The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
Coming Soon: Solar Spectrum CaK II <1A filter
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Sun Apr 14, 2024 2:33 pm
Dennis wrote: Sun Apr 14, 2024 12:13 pm
hopskipson wrote: Fri Apr 12, 2024 3:06 am I wish I could report that I have been testing the filter out but as of today I have no idea of what is going on with the filter. I talked to Mark on 2/27 and he said it was ready for testing but his weather was making it difficult. I emailed him 3 weeks later, 2 weeks after that, another week later and last week but he hasn’t responded.

Has anyone heard from him lately or placed an order? I know he’s done this before and eventually he responds but from the phone call I got, I thought it was almost ready for shipping.

With new products you never know.. might have not passed his final quality/performance check, but i hope for the best.
Yeah I get that but a simple reply to one of my emails over a month and a half is not that much to ask. I don’t mind waiting it’s the lack of communication that makes me feel uncomfortable. Or am I being unreasonable?

I dont think you are unreasonable.


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Re: New CaK etalons from Solar Spectrum

Post by Montana »

I haven't heard about mine for 18 months, even my vendor never replied to me either. I wonder if mine is lost forever :(

Alexandra


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Montana wrote: Mon Apr 15, 2024 9:16 am I haven't heard about mine for 18 months, even my vendor never replied to me either. I wonder if mine is lost forever :(

Alexandra
Don’t loose hope! I just got an email from Mark that the filter is ready to ship. Keep emailing them to get an update or PM Mark.

I haven’t had much time for imaging but as soon as I get this I will post an update and hopefully some images 🤞


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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Over a week, about 4 emails and no response from Mark, if I didn’t own a Solar Spectrum filter I would be very worried. The waiting continues :roll:


James
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Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

I heard back from Mark and the filter is on the way. It is estimated to arrive on Thursday. 🤞 I haven’t had much time for imaging but I will make time when it arrives. Don’t loose hope, Mark will get it done. Just keep trying to contact him or your dealer to get updates on the progress.


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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Fri May 03, 2024 10:09 pm I heard back from Mark and the filter is on the way. It is estimated to arrive on Thursday. 🤞 I haven’t had much time for imaging but I will make time when it arrives. Don’t loose hope, Mark will get it done. Just keep trying to contact him or your dealer to get updates on the progress.

Did it arrive?


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Cameras: imx432 + imx462
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-2x Gerd Düring 2.7x
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Dennis wrote: Sun May 12, 2024 8:34 am
hopskipson wrote: Fri May 03, 2024 10:09 pm I heard back from Mark and the filter is on the way. It is estimated to arrive on Thursday. 🤞 I haven’t had much time for imaging but I will make time when it arrives. Don’t loose hope, Mark will get it done. Just keep trying to contact him or your dealer to get updates on the progress.

Did it arrive?
Yes, it arrived on Friday. I had about 30 minutes to try it out on Saturday morning.


James
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

So it arrived on Friday and I was able to try it out. I had a little trouble with my Player One Apollo Max being recognized by Firecapture so I used my ASI174 without a reducer. I'm in the middle of moving and a home renovation project so everything is a little crazy in my house. These are basically test shots. I tried to follow some of Marks's suggestions with tuning but I had very little time to capture anything and take notes. I set up in front of my house early in the morning and had to focus manually and in the sun making it difficult along with curious neighbors to take up more of the little time I had. It was very hard to see the screen and I think my focus was a little soft. I used a 102mm F/7 masked to 83mm and a 4x telecentric to give an effective focal ratio of 34.4. I only have a 200 mm Aries Derf that I fitted to the scope with some extra long bolts. It looked a little scary but thankfully it worked.
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James
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The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

And here are some pictures of the unit. When I discussed the design with Mark the blocking filter was going to be incorporated into the telecentric but he explained that he was having a legal issue with another company so he decided against it even though it was a different design. He also mentioned having an additional tilt-tuning device but decided against it to keep the bandpass as narrow as possible. Sorry the pictures are not in order.
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James
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Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

That looks very good! Congrats on the unit.

Which telecentric are you using? Powermate?
Do you remember gain and exposure levels used?


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

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Cameras: imx432 + imx462
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Re: New CaK etalons from Solar Spectrum

Post by hopskipson »

Dennis wrote: Tue May 14, 2024 4:50 am That looks very good! Congrats on the unit.

Which telecentric are you using? Powermate?
Do you remember gain and exposure levels used?
I used the Baader 4x telecentric at F/34. I was also using the ASI174 so sampling was not close to critical. The exposure was 10 milliseconds and gain was about 200. I’m sure if I had the time to get the Apollo max to work or used a reducer I could have lower both. I’m not sure when I’ll get another chance to do a real test but this shows a lot of potential.


James
These pretzels are making me thirsty! (C.C.)
The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
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Re: New CaK etalons from Solar Spectrum

Post by Dennis »

hopskipson wrote: Tue May 14, 2024 12:34 pm
Dennis wrote: Tue May 14, 2024 4:50 am That looks very good! Congrats on the unit.

Which telecentric are you using? Powermate?
Do you remember gain and exposure levels used?
I used the Baader 4x telecentric at F/34. I was also using the ASI174 so sampling was not close to critical. The exposure was 10 milliseconds and gain was about 200. I’m sure if I had the time to get the Apollo max to work or used a reducer I could have lower both. I’m not sure when I’ll get another chance to do a real test but this shows a lot of potential.

Thanks, looking forward to more images.


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: New CaK etalons from Solar Spectrum

Post by marktownley »

Interesting and congrats on the new toy!

Very much keen to see what can be done with it with more time and a better focus!


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Re: New CaK etalons from Solar Spectrum

Post by Bob Yoesle »

The contrast looks good. Seeing and focus might be issues, but it might also be the optics are not well corrected at 394 nm. The TZ-4 definitely is not, but a new TZ-4 is rumored coming out that will be. BTW the TZ-2 will apparently be dropped - not many f15 refractors being made any more ;-)

The RG TZ-3 is corrected for CaK, and the TZ-3S and TZ-4S are also stated to also be corrected for CaK as well as Ha.

Nice to see the instructions supplied by Solar Spectrum - thanks James.

Bob


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