Search found 265 matches

by allhoest
Mon Sep 23, 2019 10:47 am
Forum: This is SolarChat !!
Topic: Prom Sept.19th Quantum 6
Replies: 16
Views: 115

Re: Prom Sept.19th Quantum 6

Very fine pics
CS
Alex
by allhoest
Mon Sep 23, 2019 10:45 am
Forum: This is SolarChat !!
Topic: Some September 21st Sun
Replies: 5
Views: 19

Re: Some September 21st Sun

Yes, very much small spots of activity.
Fine!
CS
Alex
by allhoest
Mon Sep 23, 2019 10:43 am
Forum: This is SolarChat !!
Topic: animation 20 sept big prom
Replies: 11
Views: 70

Re: animation 20 sept big prom

These proms are sooo beautiful
CS
Alex
by allhoest
Mon Sep 23, 2019 10:42 am
Forum: This is SolarChat !!
Topic: Big prom animated. 20th September
Replies: 15
Views: 129

Re: Big prom animated. 20th September

A beauty!
CS
Alex
by allhoest
Mon Sep 23, 2019 10:41 am
Forum: This is SolarChat !!
Topic: Great prom today 9/22/19
Replies: 15
Views: 94

Re: Great prom today 9/22/19

Very fine.
CS
Alex
by allhoest
Wed Sep 11, 2019 6:11 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 571

Re: A big solar newton for ultra narrowband imaging, possible?

I use the Concentrer to prepare the collimation, for centering the secondary. But for finishing the collimation, the Concentrer requires the central spot and dark conditions: http://www.spheretec.de/pdf/Collimating_with_the_Newton_Concenter_Eyepiece.pdf When there is not central spot, then star test...
by allhoest
Tue Sep 10, 2019 8:38 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 571

Re: A big solar newton for ultra narrowband imaging, possible?

In a nutshell, after having tested (with Alex and Fred) a number of options since the last 4-5 years, we are unfortunately left with the use of a large ERF for large Ha solar Newtonian. Or a newton with a central hole and treat it like a SC corrector plate, ie by MCM. But like in every treatment, t...
by allhoest
Fri Sep 06, 2019 6:43 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 571

Re: A big solar newton for ultra narrowband imaging, possible?

I was off a few days, sorry for not being responsive. After stripping the coating, I checked the mirror temperature vs surrounding. The mirror T°, taken from the side http://www.presencenet.be/nucleus2.0/media/13/20190906-20190821_01_IR_BDZB8728.JPG The bottom cell supporting ring (Wood paint in whi...
by allhoest
Sun Sep 01, 2019 7:28 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 571

Re: A big solar newton for ultra narrowband imaging, possible?

Bart, The Astronomik B, that I have, are passing from 385nm. The Baader that I have form an LRGB set is almost passing at about 400nm, so it has a poor transmission at 390..395nm. I would suggest that you get in touch with the supplier and ask for "selected" filters. Astronomik should be responsive ...
by allhoest
Sat Aug 31, 2019 8:44 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 571

A big solar newton for ultra narrowband imaging, possible?

The here subject cover the observing with aluminized mirror, thus having high flux suitable for Ha / Cak imaging. Warning: Solar observation is dangerous, we know it. There are solutions for reducing the danger: front filter, Herschell prism, de-aluminized mirror, etc. But solar observation still re...
by allhoest
Thu Aug 29, 2019 7:19 pm
Forum: This is SolarChat !!
Topic: Continuum under 450nm with good seeing
Replies: 13
Views: 245

Re: Continuum under 450nm with good seeing

Thank you for the nice comments.
Despite being made out of nuts and bold, I'm happy with this T300.

CS
Alex.
by allhoest
Wed Aug 28, 2019 6:44 pm
Forum: Solar Scope Modifications
Topic: Removing mirror’s coating
Replies: 6
Views: 172

Removing mirror’s coating

The purpose of the present operation is to remove the aluminum coating, for use in solar observation. Warning: the following manipulations involve corrosive products. It is your responsibility to take the necessary protective measures. Warning: solar observation can be dangerous if it is not practic...
by allhoest
Wed Aug 28, 2019 4:07 pm
Forum: This is SolarChat !!
Topic: Continuum under 450nm with good seeing
Replies: 13
Views: 245

Continuum under 450nm with good seeing

Here is the last solar image made in St Véran. The wind came from the south, like the days before. Generally a southerly wind is a sign of a difficult observing conditions, with unstable seeing. The best seeing comes with a westerly wind. It had to be an average imaging session and I used a 450nm fi...
by allhoest
Wed Aug 28, 2019 3:53 pm
Forum: This is SolarChat !!
Topic: Sol from the 24th of August 2019.
Replies: 13
Views: 215

Re: Sol from the 24th of August 2019.

Thank for the detail about the ATM model.
I have heard that today, etalon maker have problem finding good mica for their filters.
CS
Alex
by allhoest
Wed Aug 28, 2019 3:48 pm
Forum: This is SolarChat !!
Topic: Weekend Sunshine and OaCapture testing for Apple
Replies: 13
Views: 285

Re: Weekend Sunshine and OaCapture testing for Apple

Fine FD and beautiful prom!
Your PST looks to be a good one also.
CS
Alex.
by allhoest
Mon Aug 26, 2019 7:44 am
Forum: This is SolarChat !!
Topic: CaK Saturday 24th August
Replies: 10
Views: 212

Re: CaK Saturday 24th August

Interesting results.
Your final focal ratio would then be around 30.
What was your exposure time?

CS
Alex
by allhoest
Mon Aug 26, 2019 7:36 am
Forum: This is SolarChat !!
Topic: A better day than yesterday (Aug 24)
Replies: 10
Views: 195

Re: A better day than yesterday (Aug 24)

Very fine proms.
CS
Alex
by allhoest
Mon Aug 26, 2019 7:31 am
Forum: This is SolarChat !!
Topic: Still Raining! 24th August
Replies: 14
Views: 239

Re: Still Raining! 24th August

Beautiful!
CS
Alex
by allhoest
Mon Aug 26, 2019 7:29 am
Forum: This is SolarChat !!
Topic: Saturday Sun Aug 24th
Replies: 13
Views: 210

Re: Saturday Sun Aug 24th

"I also had a Baader IR/UV filter screwed into the nose of the Lacerta."
These polarized filters don't cut the IR, so using a UV/IR is a good idea.

"exposure time down to 122us on a 2.5x Powermate and 1ms on the x5".
Probably the powermate x5 has a factor of x6.5 or f7.

Great shots.

CS
Alex
by allhoest
Mon Aug 26, 2019 7:16 am
Forum: This is SolarChat !!
Topic: Aug 25th FDs plus a few more + 27th+29
Replies: 17
Views: 254

Re: Aug 25th FDs plus a few more

"It's difficult to get good detail around the entire disk so more practice is needed." I had in the past a SM60 with a tuner, and there was always some kind of banding. I find your pics very fine. But would you look for more uniformity, try different things to locate the reason: rotate the camera, r...
by allhoest
Mon Aug 26, 2019 7:07 am
Forum: This is SolarChat !!
Topic: Convection Cells, Limb in HA | Aug 25th 2019
Replies: 7
Views: 169

Re: Convection Cells, Limb in HA | Aug 25th 2019

I wonder the amount of dark areas / granulations rendered under 610nm.
Great shot.
CS
Alex
by allhoest
Mon Aug 26, 2019 7:04 am
Forum: This is SolarChat !!
Topic: Sol from the 24th of August 2019.
Replies: 13
Views: 215

Re: Sol from the 24th of August 2019.

Eric, the SM40 works very well!
The high resolution pics are very fine. Great!
What is ment by "Daystar ATM "?

CS
Alex
by allhoest
Mon Aug 26, 2019 7:00 am
Forum: This is SolarChat !!
Topic: A Trio of Disks - 25th August
Replies: 11
Views: 184

Re: A Trio of Disks - 25th August

"Lots of filaments note - that means an increase in the magnetic field strength"
Looks promising for more activity?
CS
Alex
by allhoest
Mon Aug 26, 2019 6:55 am
Forum: SPoD Archive
Topic: Prom Animation 25th August '19_Colour Added
Replies: 22
Views: 239

Re: Prom Animation 25th August '19

Sooo beautiful.
CS
Alex