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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 631 matches

by bart1805
Sun Nov 24, 2019 7:08 pm
Forum: Solar Scope Modifications
Topic: Took my Lunt LS50T apart to measure stuff - interesting results...
Replies: 12
Views: 294

Re: Took my Lunt LS50T apart to measure stuff - interesting results...

Remarkable, and worth the test of putting the etalon a few centimes more to the back.
by bart1805
Sun Nov 24, 2019 11:42 am
Forum: Solar Scope Modifications
Topic: "Magic" distance of Lunt LS50PT etalon from focal plane?
Replies: 15
Views: 290

Re: "Magic" distance of Lunt LS50PT etalon from focal plane?

marktownley wrote:
Sun Nov 24, 2019 11:07 am
I suppose we should define front and back too - my 'front' would be objective side, my back would be etalon side ;)
We agree. (-;
by bart1805
Sun Nov 24, 2019 10:53 am
Forum: Solar Scope Modifications
Topic: "Magic" distance of Lunt LS50PT etalon from focal plane?
Replies: 15
Views: 290

Re: "Magic" distance of Lunt LS50PT etalon from focal plane?

Ah great! I guess that's the diameter of the etalon x the focal ratio of the objective - makes sense. That 140mm is measured from the focal plane to which part of the etalon unit? To the back of the unit, so the back lens. I'd say the front lens Bart, but sat here reflecting on it all with my coffe...
by bart1805
Sat Nov 23, 2019 9:29 pm
Forum: Solar Scope Modifications
Topic: "Magic" distance of Lunt LS50PT etalon from focal plane?
Replies: 15
Views: 290

Re: "Magic" distance of Lunt LS50PT etalon from focal plane?

Roel80 wrote:
Sat Nov 23, 2019 12:02 pm
Ah great! I guess that's the diameter of the etalon x the focal ratio of the objective - makes sense.
That 140mm is measured from the focal plane to which part of the etalon unit?
To the back of the unit, so the back lens.
by bart1805
Tue Nov 12, 2019 8:54 pm
Forum: This is SolarChat !!
Topic: Mercury transit and proms
Replies: 16
Views: 226

Re: Mercury transit and proms

Congratulations, beautiful pictures and great processing! Thanks!
by bart1805
Sun Nov 10, 2019 8:43 pm
Forum: This is SolarChat !!
Topic: Sun in Ca II K - Bad seeing 20191110
Replies: 5
Views: 131

Re: Sun in Ca II K - Bad seeing 20191110

Hi Stu, the one without the Barlow, with the 1920 is by far the best. If the seeing tomorrow is as bad as it was today, that would be the one to go for in my opinion. Wish you all the luck (and a great seeing)! Bart.
by bart1805
Sun Nov 03, 2019 6:20 pm
Forum: This is SolarChat !!
Topic: How to locate the Dust Bunnies
Replies: 6
Views: 349

Re: How to locate the Dust Bunnies

Most of the time it is the camera. So check what you see if you aim just the camera to a light source.
Did you check the sensor or cleaned only the protective window?
by bart1805
Sat Nov 02, 2019 10:29 pm
Forum: This is SolarChat !!
Topic: Which etalon is better? Please, look, think and vote.
Replies: 12
Views: 709

Re: Which etalon is better? Please, look, think and vote.

I agree with Mark. Both excellent.
by bart1805
Sat Nov 02, 2019 10:27 pm
Forum: This is SolarChat !!
Topic: Black 3.0
Replies: 5
Views: 344

Re: Black 3.0

Hi Bart, I’ll be very interested to hear your assessment of black 3. :) Stu. Hi Stu, It is for sure more black than the Berger Antireflexfarb. When you see them next to each other, the Berger paint is more super dark grey. And yes, I agree with what you say: at acute angles there is still some refl...
by bart1805
Wed Oct 30, 2019 3:52 pm
Forum: This is SolarChat !!
Topic: We met the goal!...barely...:)
Replies: 4
Views: 323

Re: We met the goal!...barely...:)

Cool, that is good news!!
by bart1805
Sat Oct 26, 2019 1:00 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 1150

Re: A 6" f/8 PST mod? Are we kidding ourselves?

(150/1500) * 200 = 20 mm. It is the same as
(150/1200) * 160.
by bart1805
Sat Oct 26, 2019 11:25 am
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 1150

Re: A 6" f/8 PST mod? Are we kidding ourselves?

If it it satisfies me is not so important, if it works is the question. Yes, this is perfect.
now find the minus 160mm spot and place the GP there. Good luck!
by bart1805
Sat Oct 26, 2019 11:23 am
Forum: Solar Scope Modifications
Topic: 12" White light Newtonian
Replies: 6
Views: 314

Re: 12" White light Newtonian

marktownley wrote:
Sat Oct 26, 2019 10:58 am
bart1805 wrote:
Sat Oct 26, 2019 8:20 am
Don't forget to de-aluminise the secondary mirror!
Depends how much light you want coming through 😉
Yep, you are absolutely right!
by bart1805
Sat Oct 26, 2019 8:20 am
Forum: Solar Scope Modifications
Topic: 12" White light Newtonian
Replies: 6
Views: 314

Re: 12" White light Newtonian

Don't forget to de-aluminise the secondary mirror!
by bart1805
Fri Oct 25, 2019 7:48 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 1150

Re: A 6" f/8 PST mod? Are we kidding ourselves?

Rusted, I don't understand what you are building. It is far more simple. Place the Glasspath really close to the front lens of the etalon. In a f/10 telescope you would place the front lens of the etalon 200mm before the focus point. In a f/8 with a 1.25x Glasspath you place it 160 mm before the ori...
by bart1805
Wed Oct 23, 2019 9:50 am
Forum: This is SolarChat !!
Topic: Importance of the image restoration in the solar imaging.
Replies: 41
Views: 1304

Re: Importance of the image restoration in the solar imaging.

I take it that you have no plans to share details of your processing techniques with the solar community then? Your second post is as contributing to the solar community as your first one. Welcome to the forum! There is no such thing as a feee lunch, can you post a picture you made, maybe then we c...
by bart1805
Tue Oct 22, 2019 9:50 am
Forum: This is SolarChat !!
Topic: C11 ARIES ERF + Lunt Calcium K-Line B1200 Wedge
Replies: 12
Views: 350

Re: C11 ARIES ERF + Lunt Calcium K-Line B1200 Wedge

The ASI178MM is more sensitive in the blue than the 290MM, so that could be a good choice for CaK imaging.
by bart1805
Sun Oct 20, 2019 4:18 pm
Forum: Solar Scope Modifications
Topic: A 6" f/8 PST mod? Are we kidding ourselves?
Replies: 28
Views: 1150

Re: A 6" f/8 PST mod? Are we kidding ourselves?

With a 6 inch f/8 and a 1.25x Glasspath you place fhe glasspath at minus 160mm. The front and backlens work at their best in a f/10 beam. Hence the importance of the glasspath or masking the front lens to 120mm.
by bart1805
Sun Oct 20, 2019 4:14 pm
Forum: This is SolarChat !!
Topic: Importance of the image restoration in the solar imaging.
Replies: 41
Views: 1304

Re: Importance of the image restoration in the solar imaging.

I had absolutely no idea of the sheer power of imppg until now. I could never get it to do anything useful until today. Not just by fiddling with the controls. How, on earth, are beginners supposed to know what to do? Taken in combination, the number of possibilities for the settings must be almost...
by bart1805
Fri Oct 18, 2019 1:58 pm
Forum: This is SolarChat !!
Topic: animation on our star on October 16th
Replies: 23
Views: 511

Re: animation on our star on October 16th

Rusted wrote:
Fri Oct 18, 2019 11:44 am
What is this "internal glasspath"? A Barlow lens?
Is it a commercial unit?
I have one for sale:
viewtopic.php?f=11&t=26588
by bart1805
Mon Oct 14, 2019 8:08 pm
Forum: This is SolarChat !!
Topic: Black 3.0
Replies: 5
Views: 344

Re: Black 3.0

Hi Stu, thanks! I am curious if I can notice any difference between this paint and the Astroberger. Totally agree that baffles are the best way. CS! Bart.
by bart1805
Sun Oct 13, 2019 8:15 pm
Forum: Solar Scope Modifications
Topic: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 62
Views: 2083

Re: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)

Next I want to mod the new 10mm blocking filter to also be straight through to eliminate that mirror being in the imaging train. With the Coronado BF's, the part with the valuable BF is not threaded, it is just glued to the bottom of the eyepiece holder. First remove the BF itself. Then use heat to...
by bart1805
Sun Oct 13, 2019 8:10 pm
Forum: This is SolarChat !!
Topic: Calcium Sun
Replies: 11
Views: 368

Re: Calcium Sun

Beautiful FD's Stu! How did you manage to make these great mosaics without a visible "stitch"?
by bart1805
Sun Oct 13, 2019 8:09 pm
Forum: This is SolarChat !!
Topic: Plage Progression Through Cycle 24
Replies: 14
Views: 444

Re: Plage Progression Through Cycle 24

Really interesting Stu, what a nice project! Thanks, Bart.
by bart1805
Sun Oct 13, 2019 8:06 pm
Forum: This is SolarChat !!
Topic: Black 3.0
Replies: 5
Views: 344

Black 3.0

It seems that the paint I used for the inside of my telescopes, Berger Antireflexfarbe, can't be ordered anymore: http://www.astrogeraete.de/Antireflexfarbe.html TS offers now its own paint: https://www.teleskop-express.de/shop/product_info.php/language/en/info/p8861_TS-Optics-Antireflexfarbe---matt...