Search found 363 matches

by krakatoa1883
Tue Jul 04, 2017 12:08 pm
Forum: This is SolarChat !!
Topic: Some activity in Ca-H (July 3rd)
Replies: 4
Views: 419

Re: Some activity in Ca-H (July 3rd)

Thanks to all for your kind words.

Valery, the region have now rotated behind the limb but I hope to have another possibility in the near future. However in this season it is very hot here and tuning the Quark toward the blue side (lowest temperature) may become difficult.
by krakatoa1883
Mon Jul 03, 2017 7:22 pm
Forum: This is SolarChat !!
Topic: Some activity in Ca-H (July 3rd)
Replies: 4
Views: 419

Some activity in Ca-H (July 3rd)

This morning while looking through my Quark-CaH I noticed some activity on the W limb, a plume rising from a bright active region, so I decided to take some images notwithstanding the turbulence (the last few days have been stormy here). The images are not particularly beautiful but I am happy to ha...
by krakatoa1883
Mon Jul 03, 2017 7:03 pm
Forum: This is SolarChat !!
Topic: Amazing prom eruption at lunchtime
Replies: 19
Views: 1269

Re: Amazing prom eruption at lunchtime

Wonderful work, Alexandra. Have you used the coronagraph or your usual setup ?
by krakatoa1883
Sat Jul 01, 2017 3:05 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 6783

Re: Different Ca-K options, differences?

No problem to image at 3760 mm that corresponds to about f/29 at the image plane (sampling for 393nm). And mine is a 130mm only, a larger newtonian can do even better, the problem is not light, is the seeing.
by krakatoa1883
Fri Jun 30, 2017 7:52 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: 135mm D-ERF to a 160mm D-ERF
Replies: 5
Views: 1109

Re: 135mm D-ERF to a 160mm D-ERF

Thanks for sharing. If the intended upgrade is from 135 to 152mm I don't see much difference in terms of resolution while you would certainly need to increase the EFL in order to match the F/D requirement for the etalon. But it is also true, as stated in Baader's reply, that this requirement allows ...
by krakatoa1883
Wed Jun 28, 2017 6:08 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 6783

Re: Different Ca-K options, differences?

It is a newtonian with the primary mirror uncoated (secondary is fully reflective), it still transmits enough light for Quark. The scope is a f/5 but I use a barlow lens that brings it to f/10.
by krakatoa1883
Wed Jun 28, 2017 3:42 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 6783

Re: Different Ca-K options, differences?

The problem is that inserting the Quark Calcium into the light path uses up what back focus you have. With some scopes you will not get focus. You don't need extensions, you need a scope whose focuser retracts further inwards. Quark-Ca is short, with its 2" nose it requires only 62 mm backfocus, mo...
by krakatoa1883
Sat Jun 24, 2017 6:02 pm
Forum: This is SolarChat !!
Topic: HA 22.06.2017
Replies: 19
Views: 1355

Re: HA 22.06.2017

Fabulous prom animation! I am very impressed by the dance of the spicules on the edge :bow
by krakatoa1883
Thu Jun 22, 2017 7:37 am
Forum: This is SolarChat !!
Topic: Fabulous Sunday 18th June
Replies: 17
Views: 1125

Re: Fabulous Sunday 18th June

Very fine images, Alexandra, I like very much your processing style.

Have you used any contrast filter for the WL image ?
by krakatoa1883
Fri Jun 16, 2017 6:31 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Problems with Quark and Baader filters
Replies: 17
Views: 3326

Re: Problems with Quark and Baader filters

I decided to go all the way to -5, and just work my way up through the dial to see if a different setting worked on this scope. I adjusted to -5, and as expected, the light turned off after 30 seconds. I let it sit for 5 minutes to let it cool down on its own, turned the battery back on, and it shu...
by krakatoa1883
Fri Jun 16, 2017 6:10 pm
Forum: This is SolarChat !!
Topic: Sun Cak-H and H-alpha 15.06.17
Replies: 13
Views: 963

Re: Sun Cak-H and H-alpha 15.06.17

Absolutely fantastic! Have I understood well that you used a f/7 achromat ?
by krakatoa1883
Wed Jun 14, 2017 6:24 pm
Forum: This is SolarChat !!
Topic: The sun June 11th
Replies: 17
Views: 1118

Re: The sun June 11th

Fine images, very sharp. May you remind me what is your imaging setup ? Thanks.
by krakatoa1883
Wed Jun 14, 2017 6:19 pm
Forum: This is SolarChat !!
Topic: HA 13.06.2017 Animation Prominence
Replies: 17
Views: 1138

Re: HA 13.06.2017 Animation Prominence

Fantastic animations! How much time do they span ?
by krakatoa1883
Tue Jun 13, 2017 1:43 pm
Forum: This is SolarChat !!
Topic: Solar granulation and Ca-H with solar newtonian - June 12
Replies: 13
Views: 914

Re: Solar granulation and Ca-H with solar newtonian - June 12

sulcis2000 wrote:
Tue Jun 13, 2017 11:53 am
Fantastic work. Can you tell us what kind f setup have you used? Primary mirror has ERF coating?
no ERF, just a common parabolic mirror with its coating removed.
mirror.jpg
mirror.jpg (76.26 KiB) Viewed 873 times
by krakatoa1883
Tue Jun 13, 2017 11:48 am
Forum: This is SolarChat !!
Topic: Solar granulation and Ca-H with solar newtonian - June 12
Replies: 13
Views: 914

Re: Solar granulation and Ca-H with solar newtonian - June 12

Thanks to all for your appreciation.

@Mark: I have uncoated the primary mirror only and left the secondary untouched. Observing in WL requires about the same filtering of a Herschel prism.

Best,
by krakatoa1883
Mon Jun 12, 2017 7:35 pm
Forum: This is SolarChat !!
Topic: Solar granulation and Ca-H with solar newtonian - June 12
Replies: 13
Views: 914

Solar granulation and Ca-H with solar newtonian - June 12

An image of the solar granulation taken this morning in fine seeing with a small 130mm Skywatcher solar newtonian, Baader K-filter and 5x Powermate. With the same instrument I also taken a couple of images with a Daystar Calcium-H device, some bright details close to the limbs. sun20170612_gran_K.jp...
by krakatoa1883
Mon Jun 12, 2017 7:14 pm
Forum: This is SolarChat !!
Topic: 3 videos (WL, CaK & Ha) | LUNT152
Replies: 10
Views: 745

Re: 3 videos (WL, CaK & Ha) | LUNT152

Very nice videos with beautiful details and a pleasant soundtrack, I like Mozart piano concertos very much :bow .
by krakatoa1883
Fri Jun 09, 2017 7:25 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 6783

Re: Different Ca-K options, differences?

I agree with Astrograph. I just purchased a Quark H and I found it complements well my Baader K that I keep for imaging granulation as it provides more contrast than Baader Continuum. For me it has an advantage compared to the Lunt module: I can use it not only with my refractor but also my solar ne...
by krakatoa1883
Mon May 29, 2017 11:13 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 6783

Re: Different Ca-K options, differences?

If you look at my Google+ page linked below you can see some images I made with my Baader K filter and compare it to images taken through a more expensive Ca-K module. The filter is not bad, but as Alexandra points out it has a 80 A wide band so it delivers less contrast and less detail compared to ...
by krakatoa1883
Thu May 04, 2017 11:33 am
Forum: This is SolarChat !!
Topic: Our achievements in solar imaging. Read and see!
Replies: 12
Views: 2279

Re: Our achievements in solar imaging. Read and see!

Remarkable results indeed, very powerful setup.

BTW, the best Earth-based images of the Sun are those taken from the 98cm Swedish Solar Telescope in La Palma. They are truly incredible. Some samples can be seen in here and here.
by krakatoa1883
Thu Apr 06, 2017 11:08 am
Forum: This is SolarChat !!
Topic: Quark and TS 115 APO
Replies: 32
Views: 2548

Re: Quark and TS 115 APO

I used Quark Chromo for some time with a scope very similar to the 115 apo with decent results, but my experience is that the Combo version + a good external telecentric is better. Quality may vary, however, try two or three units if you can and choose the best one. Or follow Alexandra's recommendat...
by krakatoa1883
Thu Apr 06, 2017 10:39 am
Forum: This is SolarChat !!
Topic: Eruptions on April 3rd 2017
Replies: 5
Views: 458

Re: Eruptions on April 3rd 2017

Thanks, Alexandra, I returned home from office just in time to catch the event. AR12645 is now almost on the limb...
by krakatoa1883
Wed Apr 05, 2017 7:11 pm
Forum: This is SolarChat !!
Topic: Eruptions on April 3rd 2017
Replies: 5
Views: 458

Eruptions on April 3rd 2017

Images from April 3rd around 15:44UT (late afternoon in Europe) shortly after one of the last M-class flares from AR12644. Visually it was even more impressive, particularly while following the evolution of the long jet on the west limb. All images with Quark Chromo. Thanks for looking!
by krakatoa1883
Fri Mar 31, 2017 4:49 pm
Forum: This is SolarChat !!
Topic: AR12645 on WL and Halpha
Replies: 6
Views: 590

Re: AR12645 on WL and Halpha

In principle I would not believe too, Valery, but this is exactly what happens with my unit (may be a defective one ?). Just look at the raw images below taken during the same session: why with the native telecentric my Chromo doesn't work with the front D-ERF installed ? do you have an explanation ...
by krakatoa1883
Fri Mar 31, 2017 8:44 am
Forum: This is SolarChat !!
Topic: AR12645 on WL and Halpha
Replies: 6
Views: 590

AR12645 on WL and Halpha

I imaged the above active region in WL on 29th March and in H-alpha on 30th. WL image has been taken in fair to poor seeing conditions with 150 mm f/5 refractor stopped to 140 mm, the diameter of the front Astrosolar filter, 4x Astro Engineering Barlow. In H-alpha the one below is my first image wit...