Search found 296 matches

by krakatoa1883
Tue Oct 16, 2018 11:26 am
Forum: This is SolarChat !!
Topic: A Sunrise in there somewhere.
Replies: 8
Views: 132

Re: A Sunrise in there somewhere.

Fantastic landscapes!
by krakatoa1883
Tue Oct 16, 2018 11:25 am
Forum: This is SolarChat !!
Topic: Pro 2018.10.16
Replies: 5
Views: 47

Re: Pro 2018.10.16

Spectacular prom, Pepe!
by krakatoa1883
Tue Oct 16, 2018 11:24 am
Forum: This is SolarChat !!
Topic: Active regions image of October 14
Replies: 5
Views: 66

Re: Active regions image of October 14

Thanks Brian. Unfortunately those small spots have already disappeared...
by krakatoa1883
Mon Oct 15, 2018 5:34 pm
Forum: This is SolarChat !!
Topic: Active regions image of October 14
Replies: 5
Views: 66

Re: Active regions image of October 14

Thanks, Franco (si fa quel che si può :D )
by krakatoa1883
Mon Oct 15, 2018 11:35 am
Forum: This is SolarChat !!
Topic: 20181015-AR2724 &AR2725
Replies: 6
Views: 66

Re: 20181015-AR2724 &AR2725

Fine images, WL and H alpha are really sharp.
by krakatoa1883
Mon Oct 15, 2018 11:35 am
Forum: SPoD Archive
Topic: 20181015-AR2724 &AR2725
Replies: 6
Views: 2

Re: 20181015-AR2724 &AR2725

Fine images, WL and H alpha are really sharp.
by krakatoa1883
Mon Oct 15, 2018 11:34 am
Forum: This is SolarChat !!
Topic: Active regions image of October 14
Replies: 5
Views: 66

Active regions image of October 14

As the Sun moves into the southern hemisphere my time for solar imaging reduces to the week ends only due to office work. Saturday morning I taken few pictures of the disc and the two modest active regions now visible. Equipment as usual, my 150 mm achromat reduced to 104 (in Lunt-mod configuration)...
by krakatoa1883
Fri Oct 12, 2018 10:54 am
Forum: This is SolarChat !!
Topic: A very special prom on Oct 10
Replies: 27
Views: 405

Re: A very special prom on Oct 10

This discussion is getting very interesting now, especially with krakatoas previous post. it seems like everyone is having very different inconsistencies between usages here. Quark behavior seems quite variable between different units. When I noted the problems with the 35nm filter my first thought...
by krakatoa1883
Thu Oct 11, 2018 7:41 pm
Forum: This is SolarChat !!
Topic: A very special prom on Oct 10
Replies: 27
Views: 405

Re: A very special prom on Oct 10

that is interesting about the 35nm filter and your quark, what is your complete setup arrangement? I exposed the problem in this old discussion , however since then I couldn't find any reasonable explanation for such a behavior. In the meantime I sold the 35 and replaced with a front Baader ERF or ...
by krakatoa1883
Thu Oct 11, 2018 5:25 pm
Forum: This is SolarChat !!
Topic: A very special prom on Oct 10
Replies: 27
Views: 405

Re: A very special prom on Oct 10

My own Quark completely refuses to work if a Baader 35nm filter is placed in front of it, irrespective of filter's distance and Quark tuning. It's not a matter of temperature because the tuning can't be recovered by heating/cooling the etalon chamber. Much better is 7nm filter. BTW, excellent images...
by krakatoa1883
Mon Oct 08, 2018 6:01 pm
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 201
Views: 6020

Re: Narrowest 393.37 ever by Apollo Lasky

Looking forward to see the results of the comparison.

I am using a Baader VIP (Zeiss design) for imaging Venus in the UV and it seems very well corrected. I never use it for CaH but I can try comparing it to my Powermates.
by krakatoa1883
Mon Oct 08, 2018 9:54 am
Forum: This is SolarChat !!
Topic: Sharpening high resolution CaK images
Replies: 25
Views: 585

Re: Sharpening high resolution CaK images

Thanks for opening this very interesting question. This is one I tried to answer in the book I am publishing at the end of the month. http://www.astronomiesolaire.com/ good to know, Christian, I pre-ordered a copy. The grainy structure of the chromosphere in calcium light toward the limb can be ima...
by krakatoa1883
Sun Oct 07, 2018 5:48 pm
Forum: This is SolarChat !!
Topic: Gorgeous Prom Groups Today, HA 120mm, Oct 7th 2018
Replies: 10
Views: 211

Re: Gorgeous Prom Groups Today, HA 120mm, Oct 7th 2018

Beautiful images Marty, really spectacular.
by krakatoa1883
Sun Oct 07, 2018 5:48 pm
Forum: SPoD Archive
Topic: Gorgeous Prom Groups Today, HA 120mm, Oct 7th 2018
Replies: 10
Views: 121

Re: Gorgeous Prom Groups Today, HA 120mm, Oct 7th 2018

Beautiful images Marty, really spectacular.
by krakatoa1883
Sat Oct 06, 2018 9:21 am
Forum: Solar Scope Modifications
Topic: New Lunt Mod
Replies: 9
Views: 233

Re: New Lunt Mod

bart1805 wrote:
Fri Oct 05, 2018 8:38 pm
Wow Raf, that looks great! Congratulations!
they're Brian images, Bart ;)

Brian, are you using the extender for extracting the focus or just to enlarge the image ? In my Lunt mod I barely reach focus with my Chameleon so I inserted a Powermate between the focuser and blocking filter.
by krakatoa1883
Fri Oct 05, 2018 7:38 pm
Forum: Solar Scope Modifications
Topic: New Lunt Mod
Replies: 9
Views: 233

Re: New Lunt Mod

Thank you for the info, I am planning to purchase a 3x amplifier because my Powermate loses amplification with the distance from the lenses. Best would be a Baader TZ system but it costs much more.
by krakatoa1883
Fri Oct 05, 2018 5:28 pm
Forum: Solar Scope Modifications
Topic: New Lunt Mod
Replies: 9
Views: 233

Re: New Lunt Mod

Nice setup Brian, it seems working really fine. I don't have a DS module for my Lunt mod however my Quark increases contrast dramatically compared to the SS.

Just a question: does the ES 3x work as a telecentric amplifier ?
by krakatoa1883
Fri Oct 05, 2018 10:34 am
Forum: Solar Reference Library
Topic: For Daystar CaH quark owners
Replies: 5
Views: 287

Re: For Daystar CaH quark owners

Quark is 3968.5 by factory at 0 tuning (I do not know with how much tolerance) 5A wide and max tuning range is of 0.5A both sides of CWL, may be that some redshifted units can actually be tuned on the strongest Fe(II) line although the large BP makes the device not selective. I did not noticed much ...
by krakatoa1883
Fri Oct 05, 2018 9:32 am
Forum: This is SolarChat !!
Topic: Sharpening high resolution CaK images
Replies: 25
Views: 585

Re: Sharpening high resolution CaK images

LTHB wrote:
Tue Oct 02, 2018 11:07 pm
there are some detailed studies of it, some based on a close analysis of the DOT images, e.g.:
thanks, Frank, very much welcomed literature, it will keep me busy the next week end :D
by krakatoa1883
Thu Oct 04, 2018 12:57 pm
Forum: Solar Scope Modifications
Topic: ⚠️ ⚠️ Chroma 1.25” filter cell thermal fracture
Replies: 8
Views: 276

Re: ⚠️ ⚠️ Chroma 1.25” filter cell thermal fracture

Sorry to know this, Apollo. Yes, most probably it's the same that occurred to my red filter.
by krakatoa1883
Thu Oct 04, 2018 8:01 am
Forum: Solar Reference Library
Topic: Spicules
Replies: 1
Views: 87

Spicules

An interesting article on spicules with many data on space and time scale of this much imaged features in Ca H light. Worth a reading.

https://arxiv.org/pdf/1208.4404.pdf
by krakatoa1883
Tue Oct 02, 2018 12:29 pm
Forum: This is SolarChat !!
Topic: Sharpening high resolution CaK images
Replies: 25
Views: 585

Re: Sharpening high resolution CaK images

Deciding what processing shall be applied to calcium line images is not an easy task because it is not always clear how the chromosphere (at these wavelength) should look. Processing is a very subjective exercise to the point that most CaK (or CaH) images that one can see on the web are all somewhat...
by krakatoa1883
Mon Oct 01, 2018 7:35 pm
Forum: This is SolarChat !!
Topic: AR2723 September 30th
Replies: 16
Views: 336

Re: AR2723 September 30th

ffellah wrote:
Sun Sep 30, 2018 10:01 pm
Thank you, Peter, Bart, Marty and Raf for your nice comments. I processed this other image but do not know if it is better than the first one...
I like the first, seems more "natural", but the second is also good.
by krakatoa1883
Mon Oct 01, 2018 7:34 pm
Forum: This is SolarChat !!
Topic: Sol from the 29th of Septamber 2018.
Replies: 10
Views: 149

Re: Sol from the 29th of Septamber 2018.

Beautiful discs, Eric, I like how you processed the proms.
by krakatoa1883
Sun Sep 30, 2018 7:15 pm
Forum: This is SolarChat !!
Topic: AR2723 September 30th
Replies: 16
Views: 336

Re: AR2723 September 30th

Great images, Franco, well done, it's only a minor group but very much welcomed :D