Search found 521 matches

by allhoest
Thu Oct 05, 2023 6:38 pm
Forum: This is SolarChat !!
Topic: Prominence 05 0ctober 2023
Replies: 7
Views: 1451

Re: Prominence 05 0ctober 2023

Beautiful
Alex
by allhoest
Wed Oct 04, 2023 5:38 pm
Forum: This is SolarChat !!
Topic: M1.9 flare and eruption at AR3452 10/2/2023
Replies: 32
Views: 3147

Re: M1.9 flare and eruption at AR3452 10/2/2023

Amazing animation!
Alex
by allhoest
Mon Oct 02, 2023 6:56 pm
Forum: This is SolarChat !!
Topic: Test of a Daystar Quantum 0.5A with a T300
Replies: 5
Views: 1425

Test of a Daystar Quantum 0.5A with a T300

Hi, My project was to go toward double stack, hence I bought second hand this Quantum. Here some pics with a 300mm solar newton. https://www.presencenet.be/nucleus2.0/media/13/20231002-20230814_01_S01_33_083712_lapl4_ap3454_...._Q08.jpg https://www.presencenet.be/nucleus2.0/media/13/20231002-2023081...
by allhoest
Sun Oct 01, 2023 7:00 pm
Forum: This is SolarChat !!
Topic: Imaging with a T400 - 2023 session
Replies: 12
Views: 1281

Re: Imaging with a T400 - 2023 session

DeepSolar64 wrote: Sun Oct 01, 2023 3:02 pm The blurred part probably is atmospheric turbulence. I see this often im my images. Hot tube currents in the scope might can cause this too.
It is a full open truss telescope. The hot parts are probably the source of the problem.

CS
Alex
by allhoest
Sun Oct 01, 2023 6:57 pm
Forum: This is SolarChat !!
Topic: Imaging with a T400 - 2023 session
Replies: 12
Views: 1281

Re: Imaging with a T400 - 2023 session

Dennis wrote: Sun Oct 01, 2023 12:48 pm The blurred part can mean atmospheric turbulence, but if exposuretime is already very low then it could also come from the telescope (hot parts or filters).
I'm afraid that the hot parts are making trouble.
I need to find a solution for next year.

CS
Alex
by allhoest
Sun Oct 01, 2023 6:50 pm
Forum: Solar Scope Modifications
Topic: Solar newton T400, version 2023
Replies: 19
Views: 2657

Re: Solar newton T400, version 2023

Why do you need the dielectric secondary rather than an aluminium coated one? Are you going to be using a mica or air spaced etalon? This should only be in the Mods section? Hi, The aluminum coating has a reflection of 92 to 96% depending on the quality. The remaining 8 to 4% is transformed into he...
by allhoest
Sun Oct 01, 2023 12:25 pm
Forum: This is SolarChat !!
Topic: Imaging with a T400 - 2023 session
Replies: 12
Views: 1281

Re: Imaging with a T400 - 2023 session

Thank all.
This picture looks strange, with the blurred part in the middle.
CS
Alex
by allhoest
Sun Oct 01, 2023 12:23 pm
Forum: Solar Scope Modifications
Topic: Solar newton T400, version 2023
Replies: 19
Views: 2657

Re: Solar newton T400, version 2023

Wow.. what a project. I hope you can sort out the potential problems, im curious if it works well. Sadly couldnt watch the video, youtube says im not old enough ^^ The video on youtube is not public; you need the above link to reach it. It is also restricted (Age > 18), hence you need to login to v...
by allhoest
Sat Sep 30, 2023 8:09 pm
Forum: This is SolarChat !!
Topic: Imaging with a T400 - 2023 session
Replies: 12
Views: 1281

Imaging with a T400 - 2023 session

Hi, I attempted imaging with a - non aluminized - 400mm newton last year, but is was not very successful. I gave a new try this year. The adage this year is "what can do the best, can then do the worst". It is some kind of French proverb, I hope it doesn't sound weird in English. There is ...
by allhoest
Sat Sep 30, 2023 9:25 am
Forum: Solar Scope Modifications
Topic: Solar newton T400, version 2023
Replies: 19
Views: 2657

Solar newton T400, version 2023

As already mentioned, in solar imaging fluxes are high. Concentrating flux with optics leads to high local flux densities. The material is under high stress and can deteriorate. All kinds of situations can occur such as filter breaks, uncontrolled reflections, unexpected direct or indirect intercept...
by allhoest
Tue Sep 26, 2023 6:49 pm
Forum: This is SolarChat !!
Topic: CaK Sun 23rd September
Replies: 20
Views: 1541

Re: CaK Sun 23rd September

Very interesting this double stack :-)
Great shots.
I gave a try at f30. More to come.
CS
Alex
by allhoest
Mon Sep 25, 2023 8:42 pm
Forum: This is SolarChat !!
Topic: Solar images in Ha 25th September 2023
Replies: 10
Views: 809

Re: Solar images in Ha 25th September 2023

Excellent.
Il like very much the closeup and the proms.
Alex
by allhoest
Mon Sep 25, 2023 8:38 pm
Forum: This is SolarChat !!
Topic: Images and animations from 9/24/2023
Replies: 16
Views: 1300

Re: Images and animations from 9/24/2023

Excellent
Alex
by allhoest
Mon Sep 25, 2023 8:20 pm
Forum: This is SolarChat !!
Topic: September 23, 2023 Ha and CaK closeups
Replies: 10
Views: 1018

Re: September 23, 2023 Ha and CaK closeups

Excellent session.
Alex
by allhoest
Sat Sep 23, 2023 6:48 pm
Forum: This is SolarChat !!
Topic: Ha imaging with a T300 en Ha (II) - Solar zoo + Pinocchio
Replies: 11
Views: 894

Re: Ha imaging with a T300 en Ha (II) - Solar zoo + Pinocchio

Wow, nice results and interesting setup. How do you manage to get enough light for h-alpha with a solar newton? I can see a lot of bright dots in the surface images, what are they? Thank you all for your comments. I still rather see a lion than a bear, but I spent many years in Congo, maybe because...
by allhoest
Fri Sep 22, 2023 8:50 pm
Forum: This is SolarChat !!
Topic: Ha imaging with a T300 en Ha (II) - Solar zoo + Pinocchio
Replies: 11
Views: 894

Ha imaging with a T300 en Ha (II) - Solar zoo + Pinocchio

We speak about the celestial zoo, why not the solar zoo? Out of a Ha session, I found some features which look like animals (with a piece of imagination). Anything special here? https://www.presencenet.be/nucleus2.0/media/13/20230922-20230812_01_S01_13_082909_lapl4_ap3978_S200_...r1540_Q08.jpg https...
by allhoest
Fri Sep 22, 2023 4:53 pm
Forum: This is SolarChat !!
Topic: The ALtair 430-2 with a T300
Replies: 9
Views: 515

Re: The ALtair 430-2 with a T300

Thank you all.
CS
Alex
by allhoest
Thu Sep 21, 2023 8:40 pm
Forum: This is SolarChat !!
Topic: The ALtair 430-2 with a T300
Replies: 9
Views: 515

The ALtair 430-2 with a T300

Hi, Here a test of this new filter, with a 300mm solar newton. Probably not my best images, but the filter is well contrasted. https://www.presencenet.be/nucleus2.0/media/13/20230921-20230811_01_S01_21_092342_..._Q08.jpg https://www.presencenet.be/nucleus2.0/media/13/20230921-20230811_01_S01_32_0927...
by allhoest
Wed Sep 13, 2023 5:49 pm
Forum: This is SolarChat !!
Topic: Calcium K imaging with a T300
Replies: 3
Views: 225

Calcium K imaging with a T300

A new imaging session from St Veran. Here the filter is a 2.4A CaK from Lunt. I needed to increase the gain and exposure time. The turbulence and internal turbulence impact grandly the quality. I reduced the amount of stacked frames to respectively 15 and 22 here. https://www.presencenet.be/nucleus2...
by allhoest
Wed Sep 13, 2023 5:37 pm
Forum: Solar Reference Library
Topic: Impact of Ca K filter band pass on the visibility of filaments / comparison with SHG
Replies: 26
Views: 2126

Re: Impact of Ca K filter band pass on the visibility of filaments / comparison with SHG

Great work, very interesting.
I wonder the contrast increase by double stacking both 0.1nm.
It looks also to be a quite difficult test / observation.
I'm looking forward your further analysis / checks / high resolution pics.

CS
Alex
by allhoest
Fri Sep 01, 2023 7:39 pm
Forum: This is SolarChat !!
Topic: Antlia 393-3nm with a 300mm
Replies: 18
Views: 913

Re: Antlia 393-3nm with a 300mm

These are wonderful. A well deserved SPOD. Did you use Baader 3.8 film for these? Thank you all for the nice comments. Sorry, I'm not very active on the forum. It is a full aluminized mirror. There is probably a remaining internal turbulence in the optical train. I stacked only 10 pics. CS Alex
by allhoest
Thu Aug 31, 2023 6:29 pm
Forum: This is SolarChat !!
Topic: Antlia 393-3nm with a 300mm
Replies: 18
Views: 913

Re: Antlia 393-3nm with a 300mm

These are excellent Alex, did you have the opportunity to compare it to the 430nm G Band filter? Thank you! Yes, I tried the new 430 from Altair, but on another day. The seeing is never the same; let's see. I still have several sessions to treat and I'm back at work already. It may take me a little...
by allhoest
Wed Aug 30, 2023 7:39 pm
Forum: This is SolarChat !!
Topic: Antlia 393-3nm with a 300mm
Replies: 18
Views: 913

Antlia 393-3nm with a 300mm

Hi! Here the first pics taken with this new filter. The scope is a T300 solar newton. CS Alex https://www.presencenet.be/nucleus2.0/media/13/20230829-20230809_01_S01_33_094644_..._Q07.jpg The same spot, half an hour later: https://www.presencenet.be/nucleus2.0/media/13/20230829-20230809_01_S01_43_10...
by allhoest
Wed Aug 30, 2023 7:39 pm
Forum: SPoD Archive
Topic: Antlia 393-3nm with a 300mm
Replies: 5
Views: 916

Antlia 393-3nm with a 300mm

Hi! Here the first pics taken with this new filter. The scope is a T300 solar newton. CS Alex https://www.presencenet.be/nucleus2.0/media/13/20230829-20230809_01_S01_33_094644_..._Q07.jpg The same spot, half an hour later: https://www.presencenet.be/nucleus2.0/media/13/20230829-20230809_01_S01_43_10...
by allhoest
Thu Aug 17, 2023 7:12 pm
Forum: This is SolarChat !!
Topic: Imaging Aug 8th with a 300mm newton
Replies: 6
Views: 292

Imaging Aug 8th with a 300mm newton

Hello again :-) Here my first pics of the year made with a 300mm solar newton and a Solar Spectrum etalon. I have always problem finding the right balance during the contrast treatment. https://www.presencenet.be/nucleus2.0/media/13/20230817-20230808_01_S01_22_090441_..._Q09.jpg https://www.presence...
by allhoest
Thu Aug 17, 2023 9:39 am
Forum: This is SolarChat !!
Topic: Double stack - Solar Spectrum + Daystar Q
Replies: 6
Views: 380

Re: Double stack - Solar Spectrum + Daystar Q

Thank you Arne, Alexandra. I had once a quark. It was very contrasted, but very dark also. I have seen 2 quarks here these days. From the first one, we couldn't get any decent view. The second one was quite good over ~3/4 of the field. Yes, both etalons in my test have blockers. Discussing with Chri...
by allhoest
Wed Aug 16, 2023 4:36 pm
Forum: This is SolarChat !!
Topic: Flare Aug 7th / animation
Replies: 6
Views: 288

Flare Aug 7th / animation

Hello again, while adjusting the Etalon T°, I came across an active zone: https://www.presencenet.be/nucleus2.0/media/13/20230815-20230807_11_S02_13_162436_..._Q080.jpg We had a flare out of the most active (right) spot. Here a Youtube link: https://youtu.be/lLObGbh9zx0 One single pic: https://www.p...
by allhoest
Wed Aug 16, 2023 4:07 pm
Forum: This is SolarChat !!
Topic: Double stack - Solar Spectrum + Daystar Q
Replies: 6
Views: 380

Double stack - Solar Spectrum + Daystar Q

Hi, I'm 2 weeks on holiday at the St Veran Observatory, with a few tests on my schedule. The first one, a double stack of a Solar Spectrum and a Daystar Quantum. Here the "basic" pic made with the Solar Spectrum. https://www.presencenet.be/nucleus2.0/media/13/20230810-20230807_01_S02_13_.....
by allhoest
Thu May 25, 2023 6:38 pm
Forum: This is SolarChat !!
Topic: May 22, 2023 : big session of tests : Altair G-band, Antlia 393-3 nm, and various Ca K combinations
Replies: 19
Views: 1013

Re: May 22, 2023 : big session of tests : Altair G-band, Antlia 393-3 nm, and various Ca K combinations

Hi Christian,

Thank you for sharing your tests.
Comparing the 393 and 430, my preference goes for the 393nm.
The CaK double stack is a killer...

CS
Alex
by allhoest
Sun Aug 21, 2022 8:12 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Re: Summary of Aluminized Newton Imagery (2022 August)

I have a question! What type Etalon you use?? Coronado? Lunt? or Quark Daystar? 0.7 A? 1A? 0.5 A? What size etalon? Second question! Do you use only 5x Powermate or you can use 2.5 Powermate? Thanks! For the CaK, I use a Lunt. It should be a B1800. For Lunt + Powermate x5, I use an ASI174 with 5.86...
by allhoest
Sun Aug 21, 2022 8:02 pm
Forum: Solar Scope Modifications
Topic: Help me.(Stripping the Aluminum Coating from a Mirror)
Replies: 6
Views: 1640

Re: Help me.(Stripping the Aluminum Coating from a Mirror)

Hi Jong Ho, I have stripped several mirrors. Here a summary of one easy case and of one difficult case: https://solarchatforum.com/viewtopic.php?t=37485 https://solarchatforum.com/viewtopic.php?t=26525 I'm using Iron chloride, the same product for electronic printed circuit boards. Does it arm the m...
by allhoest
Fri Aug 19, 2022 9:22 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Re: Summary of Aluminized Newton Imagery (2022 August)

One last word: keep in mind the safety and master what you are doing.
Alex.
by allhoest
Fri Aug 19, 2022 9:20 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Re: Summary of Aluminized Newton Imagery (2022 August)

Does an interference filter works like an ERF? How much does it cost? The first interferential filter is the elliptical mirror. It has a transmission ~400..700nm, so it cut a significant part of the flux. The second one is either a blue, passing ~100nm or a red. The red I used in my test was a Baad...
by allhoest
Fri Aug 19, 2022 9:14 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Re: Summary of Aluminized Newton Imagery (2022 August)

That is some great experiment. Your WL images are fantastic. What type of Ha set-up did you use. Are you concerned with too much energy at the etalon? As shown, I can put my hand just after the telecentric; I may feel a little heat. Anyway, just to be sure, I put another interferential filter befor...
by allhoest
Fri Aug 19, 2022 9:11 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Re: Summary of Aluminized Newton Imagery (2022 August)

The results are impressive and speak for themselves. My own modest experience with solar Newtonians is there was more than enough light when the primary was non-aluminized. I even experimented with both the primary and secondary having been stripped, but this did cut down the light too much. I have...
by allhoest
Tue Aug 16, 2022 7:02 pm
Forum: This is SolarChat !!
Topic: small animation of August 16
Replies: 21
Views: 643

Re: small animation of August 16

Great captures!
Alex
by allhoest
Mon Aug 15, 2022 9:39 pm
Forum: This is SolarChat !!
Topic: Ha on Aug 7Hi,th with a T300
Replies: 15
Views: 617

Re: Ha on Aug 7Hi,th with a T300

outstanding images - St. Veran is a great place for high res imaging as soon as the weather cooperates. Is this the mirror with direct ERF coating, or your solution from last year with the ERF in front of the secondary? Thank you. Not only the weather must cooperate, but the seeing also. Today, the...
by allhoest
Mon Aug 15, 2022 9:34 pm
Forum: This is SolarChat !!
Topic: In Ha with a T300 (Aug. 10th)
Replies: 10
Views: 533

Re: In Ha with a T300 (Aug. 10th)

Hi Alex, It looks very promising. I think it is still not the full resolution of a 300mm mirror, but you have a better resolution now, than most of the H-alpha solar photos. May I ask which instrument is it? Did you use an energy rejection mirror, or a sub aperture ERF filter? Bests, Lászlo Francsi...
by allhoest
Mon Aug 15, 2022 9:32 pm
Forum: Solar Scope Modifications
Topic: Summary of Aluminized Newton Imagery (2022 August)
Replies: 13
Views: 2501

Summary of Aluminized Newton Imagery (2022 August)

Solar imagery is dangerous. The fluxes involved are high, the concentration of local energy strong, the material is subject to stress and can deteriorate, any kind of circumstance can occur such as uncontrolled reflections, interception of the direct or reflected flux or any other phenomenon unexpec...
by allhoest
Mon Aug 15, 2022 9:26 pm
Forum: This is SolarChat !!
Topic: 'First' solar light with a 400mm newton
Replies: 21
Views: 826

Re: 'First' solar light with a 400mm newton

One last question, Alex: how did you push the Powermate from 5x to 6.6x ? Franco Thank you all for your comments. I must confess that the setup isn't easy; my last session was not good. In order to check the magnification factor, I check the sun edge and use the 'circle' function of the still well ...
by allhoest
Sat Aug 13, 2022 6:05 pm
Forum: This is SolarChat !!
Topic: Sun full disk 20220616 (30 panel mosaic)
Replies: 13
Views: 587

Re: Sun full disk 20220616 (30 panel mosaic)

To make a 30 pieces mosaic, you must have pretty consistent etalon, pretty stable conditions and properly planning your individual captures in order to have no join issue.
Great job.
Alex
by allhoest
Sat Aug 13, 2022 5:36 pm
Forum: This is SolarChat !!
Topic: Saturday Sun 13th August 2022
Replies: 16
Views: 556

Re: Saturday Sun 13th August 2022

Very fine; nice to see prominence in CaK.
Alex
by allhoest
Sat Aug 13, 2022 5:34 pm
Forum: This is SolarChat !!
Topic: Sun in Whitelight 13th August 2022
Replies: 9
Views: 326

Re: Sun in Whitelight 13th August 2022

Indeed, very fine.
Alex
by allhoest
Sat Aug 13, 2022 5:29 pm
Forum: This is SolarChat !!
Topic: CaK Closeups 12th August
Replies: 11
Views: 450

Re: CaK Closeups 12th August

Very fine and detailed.
I like Cak images.
Alex
by allhoest
Sat Aug 13, 2022 5:26 pm
Forum: This is SolarChat !!
Topic: Full disks from Aug 12
Replies: 5
Views: 266

Re: Full disks from Aug 12

They are well joined and very crispy.
ALex
by allhoest
Fri Aug 12, 2022 9:50 pm
Forum: This is SolarChat !!
Topic: In Ha with a T300 (Aug. 10th)
Replies: 10
Views: 533

Re: In Ha with a T300 (Aug. 10th)

Hi Alex, It looks very promising. I think it is still not the full resolution of a 300mm mirror, but you have a better resolution now, than most of the H-alpha solar photos. May I ask which instrument is it? Did you use an energy rejection mirror, or a sub aperture ERF filter? Bests, Lászlo Francsi...
by allhoest
Thu Aug 11, 2022 7:34 pm
Forum: This is SolarChat !!
Topic: In Ha with a T300 (Aug. 10th)
Replies: 10
Views: 533

In Ha with a T300 (Aug. 10th)

Here some results from a session, where the seeing was better. Still with a 300mm solar newton. https://www.presencenet.be/nucleus2.0/media/13/20220811-20220810_01_S01_13_095119_...._Q08.jpg https://www.presencenet.be/nucleus2.0/media/13/20220811-20220810_01_S02_13_101157_...._Q08.jpg https://www.pr...
by allhoest
Thu Aug 11, 2022 7:29 pm
Forum: This is SolarChat !!
Topic: Ha on Aug 7Hi,th with a T300
Replies: 15
Views: 617

Re: Ha on Aug 7Hi,th with a T300

Thank you, Alex. Just curious: how do accommodations work at St.Veran ? Do you stay there for few days or just for the day ? Franco The standard way is to build a team, fill a form explaining what your observation program is and what your preferred week is. Then a program committee attribute the we...