Search found 598 matches

by bart1805
Mon Sep 16, 2019 7:57 pm
Forum: This is SolarChat !!
Topic: H-alpha 31 august, 7 inch Intes, reflections and a BF30.
Replies: 14
Views: 268

Re: H-alpha 31 august, 7 inch Intes, reflections and a BF30.

Hello Bart, This is a quite good image. Getting rid of these reflections is quite tricky. Keep us posted ! Christian Thanks Christian (and Alfred). The season is almost over here. Hope to start next season with an Aries 8 inch Triband Erf, to be used with the Intes 703 and the 8 inch f/8 Newton for...
by bart1805
Mon Sep 16, 2019 6:37 pm
Forum: Solar Astronomy Shop and Swap
Topic: PST etalon nosepiece with 1:1,25 glasspath
Replies: 4
Views: 51

Re: PST etalon nosepiece with 1:1,25 glasspath

Thanks :) Alexandra Alexandra, you want to attach the etalon to the visual back of the C11. You can use a SCT to 2 inch adapter. Buy a 2 inch nosepiece for the etalon and connect the two. An alternative is an adapter with SCT thread on the front, thread to attach the etalon on the back. AOK made on...
by bart1805
Mon Sep 16, 2019 8:40 am
Forum: Solar Astronomy Shop and Swap
Topic: PST etalon nosepiece with 1:1,25 glasspath
Replies: 4
Views: 51

Re: PST etalon nosepiece with 1:1,25 glasspath

Hi Alexandra,
No you don't need it. Your C11 is already f/10.
CS! Bart.
by bart1805
Sun Sep 15, 2019 12:16 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 484

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 tes...
by bart1805
Fri Sep 13, 2019 2:25 pm
Forum: Solar Astronomy Shop and Swap
Topic: PST etalon nosepiece with 1:1,25 glasspath
Replies: 4
Views: 51

PST etalon nosepiece with 1:1,25 glasspath

Nosepiece for f/8 refractor. Front adapter for PST etalon made by AOK. Inside there is a 1:1,25 Baader Glasspath,this way you can use for example a f/8 refractor in combination with a PST etalon. I used it in combination with a 150mm f/8 Skywatcher.
125 euro’s plus shipping.
by bart1805
Wed Sep 11, 2019 6:21 am
Forum: This is SolarChat !!
Topic: First animation with the Intes
Replies: 13
Views: 136

Re: First animation with the Intes

Thanks, Bart, glad you like it. As for your setup - this is with a PST etalon, correct? So the Intes can manage the required 200 mm backfocus, or is it some other approach? Yes, it is with a single PST etalon, lenses still in place. The Intes has more than enough backfocus so 200mm is not a problem...
by bart1805
Tue Sep 10, 2019 9:20 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

A set-up like this is quite ideal to check if the primary of for example your C8 is focussed the way it should with a PST mod. Just connect the train (the etalon and everything after that) and focus with the primary.
by bart1805
Tue Sep 10, 2019 9:16 pm
Forum: This is SolarChat !!
Topic: First animation with the Intes
Replies: 13
Views: 136

Re: First animation with the Intes

Great result, the high resolution is immediately noticeable. Thanks everybody! Will try and reprocess the images in a couple of days. Just found the button to record the actions in Photoshop, so now it will go faster. It seems there are some Newton Rings visible. Never seen them before in the singl...
by bart1805
Tue Sep 10, 2019 9:12 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 484

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

Second issue: there is no more central part reflecting the laser for collimation. You need then a very sturdy setup suitable to keep the collimation stable (star collimation). Maybe that can be solved when using something like this: https://www.teleskop-express.de/shop/product_info.php/language/en/...
by bart1805
Mon Sep 09, 2019 10:14 pm
Forum: This is SolarChat !!
Topic: First animation with the Intes
Replies: 13
Views: 136

First animation with the Intes

Yes, the sun is boring, but now is a great time to practice for the next gigantic sunspot. (-; Today made the first animation using the Intes 7 inch with the 160mm D-Erf. Tried to not just aim for the proms, but for a more complete view. Movie was about 15 minutes long, 30 images were used to make t...
by bart1805
Mon Sep 09, 2019 6:09 am
Forum: Solar Scope Modifications
Topic: Layout of filters in a CaK PST
Replies: 10
Views: 160

Re: Layout of filters in a CaK PST

Hi Ken, the filter that is useful is the thin one, diameter about 25 mm, it is the first one after the lens.
The one with the bright reflective coating is the one which is often deteriorated. It is way thicker than the front one.
by bart1805
Sun Sep 08, 2019 8:51 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 484

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

Thanks Laura and Langleif!
I understand the difference between the DOT and a Newton with a small secondary is huge. This winter I am going to grind my first mirror, 8 inch f/8. Will try different secondary sizes to see what the results are going to be.
by bart1805
Sun Sep 08, 2019 8:20 am
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 27
Views: 484

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

It focuses the incoming beam onto a water-cooled 1.6 mm field stop that reflects most of the image out of the telescope and transmits only a 2.5 by 2.5 arcmin subfield to the re-imaging optics and cameras. Can you compare that effect with using a very small secondary mirror in a Solar Newton? A lot...
by bart1805
Sat Sep 07, 2019 6:34 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

The front lens has to be minus 200mm, not the etalon. So in this case you position the etalon with the foucusser fully racked in. 80mm extensions before the etalon. With the front lens mounted right there.
About 200mm after the etalon will be the new focus point.
by bart1805
Sat Sep 07, 2019 5:45 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

Yep, that is how it works.
by bart1805
Sat Sep 07, 2019 5:11 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

Aha, you have taken the whole piece out, not just the front lens. It goes like this: Define the original focal point of the f/10 telescope. 200 mm before that point there has to be the front lens of the etalon. Sometimes it means cutting the telescope 4 to 6 cm, because the backfocus is somewhere be...
by bart1805
Sat Sep 07, 2019 3:44 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

Hi Marty, can you post a picture what you mean with "internal disc". Thanks!
by bart1805
Sat Sep 07, 2019 2:59 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

Ehm. The threading of the etalon is not m48. The front part of the front AOK adapter is M48. You could indeed try to install the front lens of the etalon in the nosepiece of the AOK adapter. If the telescope you are talking about has not enough back focus.
by bart1805
Sat Sep 07, 2019 2:06 pm
Forum: Solar Scope Modifications
Topic: PST, how to replace that black box?
Replies: 46
Views: 415

Re: PST, how to replace that black box?

Don't understand completely what you are saying. In a f/10 telescope the front lens should be placed at minus 200mm from the focal point. It is true that you can mount the etalon (without the front lens) further back. The distance from the backlens of the etalon to the focal point is about 200mm.
by bart1805
Tue Sep 03, 2019 8:23 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: How would a quark work with this setup?
Replies: 6
Views: 157

Re: How would a quark work with this setup?

Is that a 6 cm etalon?
If combined with a Quark yor focal ratio would be something like this:
(4.3×2000)/60 = f/143. It will not work. Even with a focal reducer there is not enough light.
by bart1805
Mon Sep 02, 2019 9:28 pm
Forum: This is SolarChat !!
Topic: H-alpha 31 august, 7 inch Intes, reflections and a BF30.
Replies: 14
Views: 268

Re: H-alpha 31 august, 7 inch Intes, reflections and a BF30.

Thanks guys! Really curious about the outcome when using a full aperture Erf. Think I have to bite that bullit.
by bart1805
Mon Sep 02, 2019 9:26 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20190831) | QUARK Chromosphere
Replies: 21
Views: 292

Re: Today's SUN (20190831) | QUARK Chromosphere

Nice images Pedro! Have you got an ADC? You could try that instead of a tilt adapter.
by bart1805
Sun Sep 01, 2019 12:57 pm
Forum: This is SolarChat !!
Topic: H-alpha 31 august, 7 inch Intes, reflections and a BF30.
Replies: 14
Views: 268

Re: H-alpha 31 august, 7 inch Intes, reflections and a BF30.

I assume the D-ERF is tilted a little bit to reduce the reflections from this surface? Similarly with the Baader 35nm? Actually, can the Baader filter be fitted on the camera nose-piece instead? I add a 656nm/7nm FWHM filter (to boost contrast) on my optical train (250mm RCT), but I place the filte...
by bart1805
Sat Aug 31, 2019 10:48 pm
Forum: This is SolarChat !!
Topic: H-alpha 31 august, 7 inch Intes, reflections and a BF30.
Replies: 14
Views: 268

Re: H-alpha 31 august, 7 inch Intes, reflections and a BF30.

Thanks Pedro! Yes I am glad it works. But the transmission is really low compared to the Lunt BF1200. So have to think about it if it is worth to experiment more. And how to make good use of it.