Search found 636 matches

by bart1805
Mon Feb 03, 2020 8:44 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 27
Views: 14985

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

Was looking at your picture again, it seems to good to be really affected by tube-seeing. Maybe it has nothing to do with the heat itself. Pure mirror systems are the best for UV and IR imaging. SCT systems are not because of the corrector. The Baader Erf opens up above 1500nm, maybe that is also tr...
by bart1805
Sun Feb 02, 2020 7:16 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 27
Views: 14985

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

How far before the Quark was the Baader Red CCD mounted when used in the SCT or the Newton?
by bart1805
Sat Feb 01, 2020 10:58 pm
Forum: This is SolarChat !!
Topic: Jan.28, 2020 Powermate comparison
Replies: 17
Views: 6604

Re: Jan.28, 2020 Powermate comparison

Nice images Phil! I would stay with the 2.5 max. When I look at the images with longer focal length I think of your images with the Quantum 6: in my opinion way better when you want more details.
by bart1805
Sat Feb 01, 2020 8:44 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 27
Views: 14985

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

A D-Erf is a Dielectric Energy Reflection Filter. In my opinion both the Baader and the Aries Erf's are D-Erf's.
by bart1805
Sat Feb 01, 2020 1:43 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 27
Views: 14985

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

Merlin66 wrote: Sat Feb 01, 2020 12:28 am George,
Marty's talking about the same Baader D-ERF used on both scopes - not Aries.....
Marty uses an Aries Triband as a front Erf.
Did you try other filters as a secondary Erf? For example something like this:
https://beloptik.de/en/uv-ircut-on-kg3-filter/
by bart1805
Wed Jan 29, 2020 8:24 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 27
Views: 14985

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

I agree. You can't compare these telescopes because of the difference in focal ratio. If you had a SCT that is f/6 and could compare it with the C8 the temperature would be a whole lot higher measured in the f/6 telescope. Besides that: secondary mirror is closer to focus than the secondary of the S...
by bart1805
Tue Jan 28, 2020 9:08 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 18
Views: 6764

Re: AR2757 January 26th, 2020

Hi Franco, looking at your images it works! I used the PST etalon with the lenses straight on my 7 inch Intes. AOK made an adapter to mount it directly to the back of the telescope. A PST etalon at f/27 is maybe a bit less narrow than in the original configuration with the lenses at f/10. Christian ...
by bart1805
Mon Jan 27, 2020 9:16 pm
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 18
Views: 6764

Re: AR2757 January 26th, 2020

Hi Franco,
Nice set-up. Second image is a big improvement!
Why do you choose to use the PST etalon in a Telecentric beam? You could choose to use it with the collimating lenses, the Celestron is f/10.
CS! Bart.
by bart1805
Sun Jan 26, 2020 11:42 am
Forum: This is SolarChat !!
Topic: PST MODs
Replies: 10
Views: 6137

Re: PST MODs

Good to see the Denkmeier mod in the Portugese sun Pedro! Good luck with it.
by bart1805
Sun Jan 19, 2020 4:07 pm
Forum: Solar Scope Modifications
Topic: Baader 1.25x GPC with PST Mod, How to Mount the GPC?
Replies: 12
Views: 7732

Re: Baader 1.25x GPC with PST Mod, How to Mount the GPC?

If your telescope you are using it with has 16cm backfocus or more, why would you put the glasspath more to the front? Just mount it in the nosepiece of and right before the etalon.
by bart1805
Mon Jan 13, 2020 9:13 pm
Forum: Solar Astronomy Shop and Swap
Topic: Astrosolar, SM40, doublestack your pst etalons etc.
Replies: 7
Views: 7095

Re: Astrosolar, SM40, doublestack your pst etalons etc.

BF30, Skybender and Spectrum upgrade (plus one of the adapters for the SM40) are sold, so updated the first post.
by bart1805
Mon Jan 13, 2020 9:05 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 35
Views: 18608

Re: PST modification - idiots guide

Yes Alexandra, that is no problem. A bit further back could be nice to see more of the sun (when the BF is small), but for HR imaging it is fine.
by bart1805
Mon Jan 13, 2020 8:55 pm
Forum: Solar Scope Modifications
Topic: How close to F10 must a PST mod truly be?
Replies: 14
Views: 8423

Re: How close to F10 must a PST mod truly be?

Yes Andy, that is how it works. Here is an example of a result with a 150mm f/8 Skywatcher, mounted in the nosepiece of the etalon was the glass path. https://solarchatforum.com/viewtopic.php?f=4&t=25937&p=233583#p233583 Idea comes from banjo, he produces a steady stream of beautiful images ...
by bart1805
Sun Jan 12, 2020 9:30 am
Forum: Solar Scope Modifications
Topic: How close to F10 must a PST mod truly be?
Replies: 14
Views: 8423

Re: How close to F10 must a PST mod truly be?

When a telescope is f/8 you place the glasspath (mounted right before the etalon) at minus 160mm. More about this in this thread:
viewtopic.php?f=9&t=26808
by bart1805
Tue Jan 07, 2020 10:27 am
Forum: Solar Astronomy Shop and Swap
Topic: Astrosolar, SM40, doublestack your pst etalons etc.
Replies: 7
Views: 7095

Re: BF30 (sold), Spectrum60 upgrade, doublestack your pst etalons etc.

pedro wrote: Tue Jan 07, 2020 9:03 am I'm interested in the Upgrade for Coronado PST
You have got mail Pedro and the upgrade is reserved for you.
CS! Bart.
by bart1805
Wed Dec 25, 2019 4:54 pm
Forum: Solar Astronomy Shop and Swap
Topic: Astrosolar, SM40, doublestack your pst etalons etc.
Replies: 7
Views: 7095

Astrosolar, SM40, doublestack your pst etalons etc.

Merry christmas for everyone and a beautiful, healthy, sunny and active 2020! Some pieces for sale. Will miss them but need the funds after buying a secondhand SolarSpectrum. CS! Bart. Baader Astrosolar 3.8. BDSF 180mm. https://www.baader-planetarium.com/en/solar-observation/baader-solar-filter/bdsf...
by bart1805
Mon Dec 23, 2019 8:16 pm
Forum: This is SolarChat !!
Topic: Solar Analemma 2016-2019
Replies: 20
Views: 4368

Re: Solar Analemma 2016-2019

Congratulations Alexandra, beautiful piece of work!!
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: 4909

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: 17
Views: 7740

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: 17
Views: 7740

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: 17
Views: 7740

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: 1643

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: 985

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: 1227

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: 2470

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: 1239

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: 1275

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: 30
Views: 11939

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: 30
Views: 11939

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: 7
Views: 4626

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: 7
Views: 4626

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: 30
Views: 11939

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: 5166

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: 1614

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: 30
Views: 11939

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: 5166

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: 2664

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: 1239

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: 89
Views: 43636

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: 1475

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: 1807

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: 1239

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...
by bart1805
Mon Oct 07, 2019 8:26 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 35
Views: 18608

Re: PST modification - idiots guide

Hi Alexandra, It all depends on the light path of the blocking filter you are going to use. With a Lunt diagonal, the distance between the back of the rubber ring of the etalon to the front edge of the diagonal is about 11 cm. If I look at your earlier pictures made with your C11, it seems that focu...
by bart1805
Fri Sep 27, 2019 7:20 am
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 25
Views: 10888

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

allhoest wrote: Wed Sep 25, 2019 5:00 pm 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
Hi Alex,
Yes, that is no problem. Could the difference be that my telescope is a closed tube?
CS, Bart.
by bart1805
Tue Sep 24, 2019 9:52 pm
Forum: This is SolarChat !!
Topic: Solar Features, High Res & FD | Sept 23rd 2019
Replies: 13
Views: 1555

Re: Solar Features, High Res & FD | Sept 23rd 2019

MalVeauX wrote: Tue Sep 24, 2019 3:52 pm
bart1805 wrote: Tue Sep 24, 2019 3:23 pm Why do you use a Gamma setting of 100?
Just to make it easier to see a high contrast to focus. Then turn gamma off and adjust as needed for histogram wanted.

Very best,
Interesting. I decrease Gamma to see more contrast, up the exposure a bit and focus. But if it works for you, don't change.
by bart1805
Tue Sep 24, 2019 3:23 pm
Forum: This is SolarChat !!
Topic: Solar Features, High Res & FD | Sept 23rd 2019
Replies: 13
Views: 1555

Re: Solar Features, High Res & FD | Sept 23rd 2019

Why do you use a Gamma setting of 100?
by bart1805
Fri Sep 20, 2019 9:55 pm
Forum: This is SolarChat !!
Topic: Prom Sept.19th Quantum 6
Replies: 16
Views: 1866

Re: Prom Sept.19th Quantum 6

Stunning pictures Phil! The Quantum works great and the images are beautifully processed.
by bart1805
Fri Sep 20, 2019 9:40 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 32
Views: 16142

Re: What do you think is the most versatile high resolution solar telescope design?

Hello Valery, Going back to the initial question of this post, and after the tests recently done à St Véran, I agree that the combination of a large ERF and a reflecting telescope is the best HR solar telescope in large diameter. The Cassegrain configuration is indeed very attractive. Best regards ...