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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 270 matches

by allhoest
Fri Nov 01, 2019 4:47 am
Forum: Solar Astronomy Shop and Swap
Topic: SSM, SM60 adapter, Powermate, etc.
Replies: 0
Views: 178

SSM, SM60 adapter, Powermate, etc.

Hi, I'm selling out some equipment. Here, the solar stuff, or usable for solar observation. Prices are without shipment. I'll ship from either Belgium or Germany. Contact: allhoest at scarlet.be CS Alex - Solar Scintallation Monitor SSM V1, original from Airylab 160Eur, which is 50% of current new p...
by allhoest
Wed Sep 25, 2019 5:00 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 30
Views: 1112

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

Hi Bart.
I use to collimate during the day at the location where I travel to.
Can you collimate with the concentrer under daylight?
CS
Alex
by allhoest
Wed Sep 25, 2019 4:57 pm
Forum: Solar Scope Modifications
Topic: New CaK filter assembly.
Replies: 5
Views: 287

Re: New CaK filter assembly.

It looks promising.
Can you push the system, whilie increasing the resolution, to detect the limit?

CS
Alex
by allhoest
Wed Sep 25, 2019 4:52 pm
Forum: Solar Scope Modifications
Topic: Budget scope for visual
Replies: 18
Views: 587

Re: Budget scope for visual

I'm not an expert but I think that uncoated mirrors reflect IR also. At least the lower part of the spectrum.

Some solar edge supplier proposes UV/IR Cut in standard.
Your system for visual use has 5% x 5% transmission.
It should be safe enough with a commercial uv/ ir

CS
Alex
by allhoest
Wed Sep 25, 2019 4:36 pm
Forum: Solar Scope Modifications
Topic: DIY Solar Wedge ND3.0 alternatives for Imaging only
Replies: 15
Views: 688

Re: DIY Solar Wedge ND3.0 alternatives for Imaging only

Hi, a few words to press what has been mentioned by others in this post. For ccd use only. Ccd interference filters let IR passing above 1100nm, depending on the maker. Take care for these polarizing filters; they led IR passing through. I would use nd3 with care; baader is offering their ND3 for us...
by allhoest
Mon Sep 23, 2019 10:47 am
Forum: This is SolarChat !!
Topic: Prom Sept.19th Quantum 6
Replies: 16
Views: 352

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: 12
Views: 313

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: 13
Views: 294

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: 16
Views: 406

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: 24
Views: 525

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: 30
Views: 1112

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: 30
Views: 1112

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: 30
Views: 1112

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: 30
Views: 1112

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: 30
Views: 1112

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: 470

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: 318

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: 470

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: 440

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: 472

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: 403

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: 395

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: 440

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: 414

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