Search found 650 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: 25
Views: 8266

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: 25
Views: 8266

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: 5657

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: 25
Views: 8266

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: 25
Views: 8266

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: 25
Views: 8266

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: 5883

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: 5883

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: 4988

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: 4421

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: 4767

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: 38
Views: 10147

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: 4943

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 with (I ...
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: 4943

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: 4767

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: 4767

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: 3184

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: 2493

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: 3075

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: 3075

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: 3075

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: 892

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: 503

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.