CAK AR3477 & 3480 using a Celestron C6R from Singapore

this is the main message area for anything solar :)
Post Reply
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

6 Nov 23. I have taken Mark's advice to put aside the SCT and use a refractor for CAK imagin. The Setup: Lunt CAK Wedge B1200 and Baader CAK filter on a Celestron C6R using a x1.5 barlow and an ASI290MM.

Image

AR3477 and AR3480

Image
Taken at UTC 0:11hrs

Image
Taken at UT0:37hrs

Seeing seems to be better at UTC 0:37hrs

Best regards.

Alfred
Last edited by yltansg on Wed Nov 08, 2023 2:48 pm, edited 1 time in total.


Dennis
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1608
Joined: Sat Apr 27, 2019 6:44 pm
Location: Germany
Has thanked: 2854 times
Been thanked: 1995 times

Re: CAK AR3477 & 3480 with Celestron C6R from Singapore

Post by Dennis »

Nice results Alfred.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
User avatar
arnedanielsen
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 7055
Joined: Fri Apr 18, 2014 10:42 pm
Location: Vestby, Norway
Has thanked: 6004 times
Been thanked: 6881 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by arnedanielsen »

Nice results Alfred!

Do you see any difference with and without the Baader CAK filter?


Best regards,
Arne
--
AstroBin: https://www.astrobin.com/users/arnedani/
User avatar
DeepSolar64
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 18534
Joined: Thu Sep 05, 2019 12:19 am
Location: Lowndesville S.C.
Has thanked: 17256 times
Been thanked: 16319 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by DeepSolar64 »

Nice work Alfred with the big achromat.


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

Image Visual Observer
" Way more fun to see it! "
User avatar
ffellah
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 11011
Joined: Mon Oct 27, 2014 6:46 pm
Location: Westport, CT USA
Has thanked: 8944 times
Been thanked: 5902 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by ffellah »

Interesting images, Alfred, first time I see this combination.

Franco


User avatar
Montana
Librarian
Librarian
Posts: 34411
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17265 times
Been thanked: 8671 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by Montana »

Wow!! these are beauties :hamster: :bow :bow I would just be careful when enhancing the contrast that you don't obscure the penumbra/umbral detail :)

Alexandra


User avatar
rigel123
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 6986
Joined: Thu Apr 08, 2021 9:26 pm
Location: Mason, OH
Has thanked: 8005 times
Been thanked: 8237 times
Contact:

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by rigel123 »

These look good Alfred.


Warren

Lunt LS60T DS
Orion ED80T CF
Meade ETX LS6
Lunt CaK BF1200
Lunt WL Wedge
Baader Photographic Film
ASI174MM
Skyris 236M

https://www.astrobin.com/users/rigel123/
User avatar
marktownley
Librarian
Librarian
Posts: 41923
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 19936 times
Been thanked: 9926 times
Contact:

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by marktownley »

Good start Alfred! The second image definitely has more resolution with the penumbral fibrils. Looking at the fibrils it looks like seeing was supporting around 80mm aperture (just over 1" seeing). Try making a 80mm mask, you will still get the same resoltion as with full aperture but the filter will see f15 which will increase contrast which will definitely help.

Any news on the new filter stack?


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

arnedanielsen wrote: Wed Nov 08, 2023 3:37 pm Nice results Alfred!

Do you see any difference with and without the Baader CAK filter?
Hi Daniel,

I must say that I am getting the same results with just the LUNT CAK B1200 Wedge. There should be an improvement but I am just not able to see it clearly. I am expecting the delivery of this system from Apollo at the end of the month:

Image

I will know then, if the seeing is good enough to bring out the details. My imaging now is to prepare the refractor and C8 for Gen5 CAK system :)

Alfred


User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

Montana wrote: Thu Nov 09, 2023 12:52 pm Wow!! these are beauties :hamster: :bow :bow I would just be careful when enhancing the contrast that you don't obscure the penumbra/umbral detail :)

Alexandra
Thanks for the tip, Alexandra. This is the best I can do now:
Image

I have to improve on my post-processing, especially when expecting the delivery of this system:

Image

Alfred


Dennis
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1608
Joined: Sat Apr 27, 2019 6:44 pm
Location: Germany
Has thanked: 2854 times
Been thanked: 1995 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by Dennis »

yltansg wrote: Fri Nov 10, 2023 8:49 am
arnedanielsen wrote: Wed Nov 08, 2023 3:37 pm Nice results Alfred!

Do you see any difference with and without the Baader CAK filter?
Hi Daniel,

I must say that I am getting the same results with just the LUNT CAK B1200 Wedge. There should be an improvement but I am just not able to see it clearly.

Alfred, why do you expect a improvement of contrast with the baader filter? It is most likely too wide to do much.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

marktownley wrote: Fri Nov 10, 2023 6:30 am Good start Alfred! The second image definitely has more resolution with the penumbral fibrils. Looking at the fibrils it looks like seeing was supporting around 80mm aperture (just over 1" seeing). Try making a 80mm mask, you will still get the same resoltion as with full aperture but the filter will see f15 which will increase contrast which will definitely help.

Any news on the new filter stack?
Dear Mark,

I always marvel at how some of our friends in this forum, like you are able to look at the image and deduce the seeing condition and suggest a more suitable aperture for optimising the acquisition. I will definitely try that. Thank you very much.

Regarding the new filter stack, Apollo has tested it to be a 0.6 Angstrom system with a 75% transmission at the camera. It should reach me by end of Nov 23. I will build a 80mm mask for the first light.

Alfred


User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

Dennis wrote: Fri Nov 10, 2023 9:47 am
yltansg wrote: Fri Nov 10, 2023 8:49 am
arnedanielsen wrote: Wed Nov 08, 2023 3:37 pm Nice results Alfred!

Do you see any difference with and without the Baader CAK filter?

Alfred, why do you expect a improvement of contrast with the baader filter? It is most likely too wide to do much.
Hi Dennis,

That is a good point. I was just curious to see if there are any improvement :)

Alfred


Dennis
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1608
Joined: Sat Apr 27, 2019 6:44 pm
Location: Germany
Has thanked: 2854 times
Been thanked: 1995 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by Dennis »

yltansg wrote: Fri Nov 10, 2023 3:35 pm
Dennis wrote: Fri Nov 10, 2023 9:47 am
yltansg wrote: Fri Nov 10, 2023 8:49 am

Hi Dennis,

That is a good point. I was just curious to see if there are any improvement :)

Alfred
I tried it too with the Baader as blocker (since im not using the blockers that come with the Lunt module), but its not doing a great job there. I had much better results with the Antlia 393nm 3nm filter to block offband light.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
User avatar
MapleRidge
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 10146
Joined: Fri Jan 13, 2012 11:58 pm
Location: Cambray, ON Canada
Has thanked: 64 times
Been thanked: 4245 times
Contact:

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by MapleRidge »

Hi Alfred...

Great to see these CaK images, and they are well done :bow

I used this OTA for some time with the Lunt B1800CaK filter and it always did a good job. I found that the addition of the Baader K-Line filter in the camera nose-piece helped make the contrast a little better. Not a large amount, but a little better.

I believe that the CaK performance of this scope can be improved by changing the spacing between the objective elements...do you plan to try this? I never got a chance to try mine.

Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI290MM/ASI462+ADC

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK and Baader K-Line
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

MapleRidge wrote: Sat Nov 11, 2023 12:28 am Hi Alfred...

Great to see these CaK images, and they are well done :bow

I used this OTA for some time with the Lunt B1800CaK filter and it always did a good job. I found that the addition of the Baader K-Line filter in the camera nose-piece helped make the contrast a little better. Not a large amount, but a little better.

I believe that the CaK performance of this scope can be improved by changing the spacing between the objective elements...do you plan to try this? I never got a chance to try mine.

Brian
Hi Brian,

I will surely do it if it improves the performance of the refractor. Do you know if there is a site where I can learn how to do it?

Alfred


User avatar
marktownley
Librarian
Librarian
Posts: 41923
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 19936 times
Been thanked: 9926 times
Contact:

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by marktownley »

yltansg wrote: Sat Nov 11, 2023 7:55 am
MapleRidge wrote: Sat Nov 11, 2023 12:28 am Hi Alfred...

Great to see these CaK images, and they are well done :bow

I used this OTA for some time with the Lunt B1800CaK filter and it always did a good job. I found that the addition of the Baader K-Line filter in the camera nose-piece helped make the contrast a little better. Not a large amount, but a little better.

I believe that the CaK performance of this scope can be improved by changing the spacing between the objective elements...do you plan to try this? I never got a chance to try mine.

Brian
Hi Brian,

I will surely do it if it improves the performance of the refractor. Do you know if there is a site where I can learn how to do it?

Alfred
Just unscrew the retaining ring from the lens cell, take out objective, replace the spacers with thicker ones. Replace lens and screw back down the retaining ring.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

marktownley wrote: Sat Nov 11, 2023 9:52 am Just unscrew the retaining ring from the lens cell, take out objective, replace the spacers with thicker ones. Replace lens and screw back down the retaining ring.
Thank you, Mark.

Alfred


User avatar
EdAstle
Oh, I get it now!
Oh, I get it now!
Posts: 36
Joined: Thu Aug 10, 2023 10:59 pm
Has thanked: 26 times
Been thanked: 49 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by EdAstle »

Hi Alfred - I've taken my Skywatcher 150 f/8 lens out to "split the stack" and give them a good clean. The 3 spacers are between the 2 lenses. I needed to gently pry the lenses apart - at nearly 15 years old they didn't come apart easily.

This post by Eddgie was very useful to me:
https://www.cloudynights.com/topic/5792 ... ctor-lens/

There's a great thread here by Bob Yoesle regarding respacing for Ca-K. 3.2mm is the magic number for a C6-R:
viewtopic.php?t=31786

You can buy packs of "shim washers" from ebay and elsewhere; 0.1mm, 0.2mm, 1mm etc.

Regarding pulling the 2 lenses apart - mark everything with weak stickies. I used small bits of post-it notes.
Most important is to not put the lenses back in upside down when you're done!

The 2 lenses will have been aligned at the factory. There were pencil markings around the edges of the lenses - make sure those lines match up when putting them back together - line #1 on lens #1 must align with line #1 on lens #2. There were a few pencil lines drawn down both lenses and those lines are not numbered. Or just draw a new line down both edges and use that for reference.

The big retaining ring was stiff as heck. I used a "pointy hole maker" in the notch of the ring and needed quite some careful force to get it to loosen. Once that stiction was broken it undid easily.

It's not hard - just daunting when doing it for the first time.
Good luck! And great pics!

Regards,
Ed


We can forgive a child who is afraid of the dark. The real tragedy is when men are afraid of the light. (Plato)

Late to the solar party - April 2023. Missed 5 cycles. Much to learn. Much to spend.

Boxed for 15 years - Zenithstar 80, Skywatcher 150 f8, Celestron C9.25.
Now all have seen the Sun and demand I spend further, without regret.
User avatar
eroel
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 9362
Joined: Mon Dec 19, 2011 10:45 pm
Location: México D.F.
Been thanked: 4830 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by eroel »

Alfred:
Good results with the refractor.
Best regards.
Eric.


User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

EdAstle wrote: Sat Nov 11, 2023 1:57 pm Hi Alfred - I've taken my Skywatcher 150 f/8 lens out to "split the stack" and give them a good clean. The 3 spacers are between the 2 lenses. I needed to gently pry the lenses apart - at nearly 15 years old they didn't come apart easily.

This post by Eddgie was very useful to me:
https://www.cloudynights.com/topic/5792 ... ctor-lens/

There's a great thread here by Bob Yoesle regarding respacing for Ca-K. 3.2mm is the magic number for a C6-R:
viewtopic.php?t=31786

You can buy packs of "shim washers" from ebay and elsewhere; 0.1mm, 0.2mm, 1mm etc.

Regarding pulling the 2 lenses apart - mark everything with weak stickies. I used small bits of post-it notes.
Most important is to not put the lenses back in upside down when you're done!

The 2 lenses will have been aligned at the factory. There were pencil markings around the edges of the lenses - make sure those lines match up when putting them back together - line #1 on lens #1 must align with line #1 on lens #2. There were a few pencil lines drawn down both lenses and those lines are not numbered. Or just draw a new line down both edges and use that for reference.

The big retaining ring was stiff as heck. I used a "pointy hole maker" in the notch of the ring and needed quite some careful force to get it to loosen. Once that stiction was broken it undid easily.

It's not hard - just daunting when doing it for the first time.
Good luck! And great pics!

Regards,
Ed
Dear Ed,

Thank you for sharing your experience and the very useful links.

I will be away visiting a friend in Japan. Will look into buying the spacers to increase the spacing to 3.2mm. Will report my learning points here too :)

Alfred
Last edited by yltansg on Sun Nov 12, 2023 9:15 am, edited 1 time in total.


User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

eroel wrote: Sat Nov 11, 2023 4:36 pm Alfred:
Good results with the refractor.
Best regards.
Eric.
Thank you, Eric for your encouragement and well wishes.

Alfred


User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

EdAstle wrote: Sat Nov 11, 2023 1:57 pm Hi Alfred - I've taken my Skywatcher 150 f/8 lens out to "split the stack" and give them a good clean. The 3 spacers are between the 2 lenses. I needed to gently pry the lenses apart - at nearly 15 years old they didn't come apart easily.

You can buy packs of "shim washers" from ebay and elsewhere; 0.1mm, 0.2mm, 1mm etc.

Ed
Hi Ed,

I am excited to get started for this project. I did a google search for shim washers. There are different type of materials available - steel, bronze etc. What is a good material to buy for objective lens separator? Did you buy yours from an online store?

Alfred


User avatar
marktownley
Librarian
Librarian
Posts: 41923
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 19936 times
Been thanked: 9926 times
Contact:

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by marktownley »

yltansg wrote: Sun Nov 12, 2023 9:27 am
EdAstle wrote: Sat Nov 11, 2023 1:57 pm Hi Alfred - I've taken my Skywatcher 150 f/8 lens out to "split the stack" and give them a good clean. The 3 spacers are between the 2 lenses. I needed to gently pry the lenses apart - at nearly 15 years old they didn't come apart easily.

You can buy packs of "shim washers" from ebay and elsewhere; 0.1mm, 0.2mm, 1mm etc.

Ed
Hi Ed,

I am excited to get started for this project. I did a google search for shim washers. There are different type of materials available - steel, bronze etc. What is a good material to buy for objective lens separator? Did you buy yours from an online store?

Alfred
Cork or rubber would work too. You just need something approximately 3mm thick.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2766
Joined: Sat Jun 14, 2014 9:33 am
Location: Singapore (1.3N, 103.7E)
Has thanked: 1403 times
Been thanked: 1353 times

Re: CAK AR3477 & 3480 using a Celestron C6R from Singapore

Post by yltansg »

marktownley wrote: Sun Nov 12, 2023 9:36 am
Cork or rubber would work too. You just need something approximately 3mm thick.
[/quote]

Thanks, Mark!!

Alfred


Post Reply