Search found 896 matches

by krakatoa1883
Sun Sep 13, 2020 7:25 pm
Forum: Solar Scope Modifications
Topic: Replacing Lunt CaK BF with something better
Replies: 17
Views: 813

Replacing Lunt CaK BF with something better

In this discussion I described the problem I had with the blocking filter assembly of my Lunt module, mainly coma and astigmatism due to the tilted filters. Placing a focal extender before the BF helped in obtaining a better definition however this cannot be a solution if one wants to image the full...
by krakatoa1883
Fri Sep 11, 2020 3:21 pm
Forum: This is SolarChat !!
Topic: Competition Winner- Alexandra
Replies: 37
Views: 1014

Re: Competition Winner- Alexandra

Great! congratulations...
by krakatoa1883
Tue Sep 08, 2020 3:22 pm
Forum: This is SolarChat !!
Topic: Quiet sun today September 6, 2020
Replies: 15
Views: 415

Re: Quiet sun today September 6, 2020

Great images, Franco, very crisp.
by krakatoa1883
Wed Aug 26, 2020 1:59 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa PT deassembly- the saga continues lol
Replies: 3
Views: 781

Re: Lunt LS50THa PT deassembly- the saga continues lol

Bring up this old discussion because I have just published a short note on replacing the o-rings for Lunt LS50, this is the link: https://imagesofoursun.wordpress.com/maintenance/replacing-lunt-ls50tha-pressure-tuner-o-rings/ (for moderators, think this discussion should be moved to a different sect...
by krakatoa1883
Fri Aug 21, 2020 4:28 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: August 3, 2020 Spectroheliograms: the Fraunhofer Four
Replies: 7
Views: 508

Re: August 3, 2020 Spectroheliograms: the Fraunhofer Four

Than you very much Peter, I am starting with the book and your own articles, surely I will return with furter questions ;)
by krakatoa1883
Fri Aug 21, 2020 12:36 pm
Forum: This is SolarChat !!
Topic: Solar granulation with C14HD full aperture 2020.08.19
Replies: 14
Views: 515

Re: Solar granulation with C14HD full aperture 2020.08.19

ND 3.8 Astrosolar is still available although in the mounted version only, no longer as a loose foil. https://www.teleskop-express.de/shop/product_info.php/info/p8814_Baader-Digital-Solar-Filter-3-8-OD--aperture-240-mm--for-tubes--260-300-mm.html https://www.baader-planetarium.com/en/solar-observati...
by krakatoa1883
Fri Aug 21, 2020 12:25 pm
Forum: This is SolarChat !!
Topic: A few from today 20th Aug '20
Replies: 9
Views: 345

Re: A few from today 20th Aug '20

Great, Stu, CaK is particularly fine.
by krakatoa1883
Tue Aug 18, 2020 10:00 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: August 3, 2020 Spectroheliograms: the Fraunhofer Four
Replies: 7
Views: 508

Re: August 3, 2020 Spectroheliograms: the Fraunhofer Four

Very interesting and detailed images, Peter.

If I want to build a spectroheliograph by myself where should I start from ? Being a physicist I know the theory but I need some practical advice. Thanks
by krakatoa1883
Sun Aug 16, 2020 3:11 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of August 2020.
Replies: 8
Views: 313

Re: Sol from the 15th of August 2020.

Great prominence pictures, Eric!
by krakatoa1883
Sun Aug 16, 2020 3:10 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200816) | HR WL X5 SSM
Replies: 9
Views: 458

Re: Today's SUN (20200816) | HR WL X5 SSM

Great work, Pedro, very clean granulation.
by krakatoa1883
Sun Aug 16, 2020 3:07 pm
Forum: This is SolarChat !!
Topic: sun animation August 14 part II
Replies: 7
Views: 303

Re: sun animation August 14 part II

Great animation and fine picture.
by krakatoa1883
Mon Aug 10, 2020 12:45 pm
Forum: This is SolarChat !!
Topic: A few from August 7th
Replies: 12
Views: 347

Re: A few from August 7th

Lovely H-alpha images and fine Jupiter too
by krakatoa1883
Mon Aug 10, 2020 12:21 pm
Forum: Solar Scope Modifications
Topic: Lunt Pressure Tuner + Quark Question
Replies: 5
Views: 471

Re: Lunt Pressure Tuner + Quark Question

Here is a picture of my set up and a couple of images. Usually I reserve the stacking to good seeing conditions as it's not always easy to find the best matching between PT and Quark tunings, for example my Quark tunes better in summer, Lunt PT in winter :D (don't ask me why) but when both tunings m...
by krakatoa1883
Mon Aug 10, 2020 12:05 pm
Forum: This is SolarChat !!
Topic: AR2770 August 9th, 2020
Replies: 17
Views: 642

Re: AR2770 August 9th, 2020

Good images, Franco, with fine spicule details.
by krakatoa1883
Mon Aug 10, 2020 12:04 pm
Forum: This is SolarChat !!
Topic: Sol from the 9th of August 2020.
Replies: 13
Views: 463

Re: Sol from the 9th of August 2020.

Great images, Eric, I saw that prom but couldn't take any image.
by krakatoa1883
Fri Aug 07, 2020 3:13 pm
Forum: Solar Scope Modifications
Topic: Lunt Pressure Tuner + Quark Question
Replies: 5
Views: 471

Re: Lunt Pressure Tuner + Quark Question

Agere with Mark, there should be something in the train that makes image considerably dimmer.

With front DERF ---> Lunt PT ---> Quark BF ---> Quark etalon I don't have any issue... however my Lunt part is SS, not DS.
by krakatoa1883
Thu Aug 06, 2020 1:48 pm
Forum: This is SolarChat !!
Topic: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet
Replies: 19
Views: 724

Re: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet

The best I've seen so far through amateur equipment, great detail indeed. With my 130 mm solar newtonian CaH/CaK is possibile as there is enough light, I am now considering an upgrade to a 200 mm one (300 would be too much for me).

That Alluxa filter is miraculous...
by krakatoa1883
Thu Aug 06, 2020 1:38 pm
Forum: This is SolarChat !!
Topic: Full disk 05-08-2020
Replies: 12
Views: 384

Re: Full disk 05-08-2020

Great discs, Rainer.
by krakatoa1883
Thu Aug 06, 2020 1:13 pm
Forum: This is SolarChat !!
Topic: August 5, 2020 Ha FD
Replies: 8
Views: 312

Re: August 5, 2020 Ha FD

Great disc. Gradient option in GIMP may help you to get an even disc in postprocessing, I tried it and sometimes works.
by krakatoa1883
Thu Aug 06, 2020 1:08 pm
Forum: This is SolarChat !!
Topic: August 4: H alpha series
Replies: 11
Views: 513

Re: August 4: H alpha series

Great images, Peter, H-alpha is really 3D... Any detail about your telecentric ?
by krakatoa1883
Mon Aug 03, 2020 2:48 pm
Forum: This is SolarChat !!
Topic: Calcium Sunday 2nd August
Replies: 22
Views: 755

Re: Calcium Sunday 2nd August

I understand, Mark. The owner of Tecnosky is a good friend of mine, I'll ask him if can provide further details on that scope.
by krakatoa1883
Mon Aug 03, 2020 8:09 am
Forum: This is SolarChat !!
Topic: Calcium Sunday 2nd August
Replies: 22
Views: 755

Re: Calcium Sunday 2nd August

Hi Raf, have you had any experience with the Technosky 152/8 fpl-51 triplet? there's one here in the UK going at a good price... yes but not for solar, I looked into the scope of a friend of mine, cant' tell nothing about H-alpha or calcium. However I wouldn't consider it unless you can look at the...
by krakatoa1883
Sun Aug 02, 2020 4:25 pm
Forum: This is SolarChat !!
Topic: Sol from the 1st of August 2020.
Replies: 11
Views: 467

Re: Sol from the 1st of August 2020.

Great images, Eric, H-alpha with Daystar filter is impressive, very sharp and very well processed!