Fantastic landscapes!

Spectacular prom, Pepe!

Thanks Brian. Unfortunately those small spots have already disappeared...

Thanks, Franco (si fa quel che si può )

Fine images, WL and H alpha are really sharp.

Fine images, WL and H alpha are really sharp.

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)...

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...

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 ...

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...

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.

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...

Beautiful images Marty, really spectacular.

Beautiful images Marty, really spectacular.

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.

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.

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 ?

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 ...

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

Sorry to know this, Apollo. Yes, most probably it's the same that occurred to my red filter.

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

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...

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.

Beautiful discs, Eric, I like how you processed the proms.

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