Search found 348 matches

by krakatoa1883
Tue Dec 11, 2018 8:06 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Herschel Wedge with 152mm 1200 TMB refractor?
Replies: 4
Views: 119

Re: Herschel Wedge with 152mm 1200 TMB refractor?

I normally use a Baader CC with my 150 mm f/5 refractor without problems. Inside the wedge there are ND3.0 + ND06 filters. Someone adds a UV/IR cut before or after the wedge, I am not sure it is necessary.
by krakatoa1883
Tue Dec 11, 2018 7:59 pm
Forum: This is SolarChat !!
Topic: Prominences 11.12.2018
Replies: 10
Views: 161

Re: Prominences 11.12.2018

Fantastic images! Which instrument have you used for the comet ?
by krakatoa1883
Tue Dec 11, 2018 12:34 pm
Forum: This is SolarChat !!
Topic: Another Quark Question
Replies: 9
Views: 297

Re: Another Quark Question

As far as contrast and definition are concerned, yes, with an external amplifier my Quark works better than in the original configuration, not a huge difference but is there, in particular if an external or internal ERF is placed in front of the device. Actually this is the reason that lead me to re...
by krakatoa1883
Mon Dec 10, 2018 8:23 am
Forum: This is SolarChat !!
Topic: November 9th
Replies: 8
Views: 102

Re: November 9th

Great images Brian. I see some horizontal lines crossing the discs is WL and CaK... or is it my monitor ?
by krakatoa1883
Mon Dec 10, 2018 8:20 am
Forum: This is SolarChat !!
Topic: Sunday 9th December 2018
Replies: 14
Views: 172

Re: Sunday 9th December 2018

Very, very beautiful discs Alexandra. I understand that you images are with N up and E left ?
by krakatoa1883
Sun Dec 09, 2018 8:11 pm
Forum: This is SolarChat !!
Topic: Another Quark Question
Replies: 9
Views: 297

Re: Another Quark Question

I'm not sure you can unscrew the telecentric on the later batch quarks? the telecentric is mounted in an inner black barrel that can't be removed from the device body without making the Quark unusable, however each lens group can be removed separately leaving the body as it is. The BF shall of cour...
by krakatoa1883
Fri Dec 07, 2018 5:43 pm
Forum: This is SolarChat !!
Topic: Sunspot in AR2729 still there! HA | Dec 6th 2018
Replies: 9
Views: 118

Re: Sunspot in AR2729 still there! HA | Dec 6th 2018

Great images Marty, the group is still there, I counted 14 small spots this morning.
by krakatoa1883
Wed Dec 05, 2018 8:20 pm
Forum: This is SolarChat !!
Topic: Another Quark Question
Replies: 9
Views: 297

Re: Another Quark Question

Hi Brian the telecentric is composed by two doublets, the large converging one can be removed by separating the red and the black barrels of the Quark. It is placed in the black barrel and can be easily taken out by unscrewing its retaining ring (NB, opening the Quark will void the warranty). For re...
by krakatoa1883
Thu Nov 22, 2018 6:16 pm
Forum: This is SolarChat !!
Topic: Citizen Science
Replies: 24
Views: 873

Re: Citizen Science

It's great, Stu, a fantastic opportunity. I don't have particularly good images for contributing but I am sure you'll collect many fine pictures for your presentation from our most skilled forum members. Thanks for sharing with us.
by krakatoa1883
Wed Nov 21, 2018 11:58 am
Forum: This is SolarChat !!
Topic: Sol from the 20th of November 2018.
Replies: 8
Views: 249

Re: Sol from the 20th of November 2018.

Great captures, Eric. Is that one your average daytime seeing or is it generally better/worse ?
by krakatoa1883
Sun Nov 18, 2018 12:31 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20181116) with good seeing
Replies: 14
Views: 381

Re: Today's SUN (20181116) with good seeing

Excellent images, Pedro, thanks for detailing the flat field procedure, very useful.
by krakatoa1883
Sun Nov 18, 2018 12:27 pm
Forum: This is SolarChat !!
Topic: Still orbiting around the Sun....
Replies: 8
Views: 228

Re: Still orbiting around the Sun....

Thanks to all for your comments, very kind :)

The group is still there, both the trailing and following spots are slightly larger than yesterday, look at it if you can.
by krakatoa1883
Sat Nov 17, 2018 3:12 pm
Forum: This is SolarChat !!
Topic: Still orbiting around the Sun....
Replies: 8
Views: 228

Still orbiting around the Sun....

Today first clear and sunny day since October 20th. Of course the seeing is terrible as the atmospheric circulation changed from a humid and cloudy African anticyclone to a dry Russian cyclone together with an abrupt temperature fall. No high resolution possible however I did my best to capture a fu...
by krakatoa1883
Thu Nov 15, 2018 2:01 pm
Forum: This is SolarChat !!
Topic: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018
Replies: 13
Views: 408

Re: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018

You should determine by yourself what is the reducing factor for a given distance from the converging lens to the camera sensor. It's enough to point the scope to a distant object and see how larger becomes the field of view with the reducer. There are actually different reducers available for use w...
by krakatoa1883
Wed Nov 14, 2018 11:45 am
Forum: This is SolarChat !!
Topic: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018
Replies: 13
Views: 408

Re: Sunspot 2726, Big Prom, Full Disc | 150mm & 40mm HA | Nov 13th 2018

Excellent work, Marty. Why don't you insert a focal reducer before the camera ? It would help to obtain a larger view.
by krakatoa1883
Wed Nov 14, 2018 11:43 am
Forum: This is SolarChat !!
Topic: Cool calcium prom 11-13-2018
Replies: 4
Views: 229

Re: Cool calcium prom 11-13-2018

Fine prom video, Apollo.
by krakatoa1883
Mon Nov 12, 2018 1:29 pm
Forum: This is SolarChat !!
Topic: Sol from the 10th of November 2018.
Replies: 10
Views: 238

Re: Sol from the 10th of November 2018.

Fantastic proms, Eric!
by krakatoa1883
Mon Nov 12, 2018 1:27 pm
Forum: This is SolarChat !!
Topic: Solar panorama in Ca II K 11th Nov.
Replies: 6
Views: 255

Re: Solar panorama in Ca II K 11th Nov.

You CaK setup is a winner, Stu, nice image!
by krakatoa1883
Mon Nov 12, 2018 1:25 pm
Forum: This is SolarChat !!
Topic: Sun November 11th
Replies: 16
Views: 414

Re: Sun November 11th

At least you're able to see the Sun, my last image was one month ago, since then always cloudy here :lol:

Nice disc, and how many colors around you, a very beautiful nature
by krakatoa1883
Sun Nov 11, 2018 8:04 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 31
Views: 1393

Re: Mg II in UltraViolet

In my opinion for hires imaging in the near UV correcting the system for SA is much more important that enlarging the D-L field, thus an all-reflecting system would definitely be much more preferable than modifying a SCT. BTW, one can consider a commercial Cassegrain , it is a relatively inexpensive...
by krakatoa1883
Sun Nov 11, 2018 7:47 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk 11th November
Replies: 11
Views: 305

Re: Ha Full Disk 11th November

Nice disc, Mark, with lot of details for a solar minimum. The bright zone on the left of the center disc has now evolved in a B-class sunspot group. It is bright in UV and SE of it another bright patch is developing.
by krakatoa1883
Sun Nov 11, 2018 2:33 pm
Forum: This is SolarChat !!
Topic: High latitude sunspot
Replies: 15
Views: 546

Re: High latitude sunspot

Thanks, Mark, graph is very clear. I put my Wolf numbers in a graph too, the overall (N + S) double peak is apparent
Wolf.jpg
Wolf.jpg (23.56 KiB) Viewed 373 times
by krakatoa1883
Fri Nov 09, 2018 4:18 pm
Forum: This is SolarChat !!
Topic: High latitude sunspot
Replies: 15
Views: 546

Re: High latitude sunspot

I remember that spot, it was actually at even higher latitude (+36°) however as it appeared already close to the W limb the magnetic pattern was unclear, may be the N pole is preceding but I am not sure
0408L.jpg
0408L.jpg (32.14 KiB) Viewed 452 times
Thanks Alexandra for the comparison box.
by krakatoa1883
Thu Nov 08, 2018 8:02 pm
Forum: This is SolarChat !!
Topic: High latitude sunspot
Replies: 15
Views: 546

High latitude sunspot

It's raining here (since three weeks...) :( but browsing SDO images a high latitude spot is present, maybe belonging to the 25th cycle. Has anyone already imaged it ?