Search found 636 matches

by bart1805
Wed Sep 18, 2019 9:16 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: PST etalon repair, decontacted?
Replies: 14
Views: 4603

Re: PST etalon repair, decontacted?

Yes you need the spacers, this is how it should look like sideways:
https://pbase.com/reneweenink/image/167846098
by bart1805
Wed Sep 18, 2019 8:58 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 14May2019 Spectroheliograms: H alpha
Replies: 9
Views: 3810

Re: 14May2019 Spectroheliograms: H alpha

Wow! And I thought that my image train was long....
Thanks for the explanation and images. Be gentle to your heart, take care!
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: 15
Views: 2116

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: 3731

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: 3731

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: 25
Views: 10919

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: 3731

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: 1795

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: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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: 1795

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: 25
Views: 10919

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: 1795

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: 7
Views: 3839

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: 25
Views: 10919

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: 25
Views: 10919

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: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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 5:11 pm
Forum: Solar Scope Modifications
Topic: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 89
Views: 43739

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: 3526

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: 15
Views: 2116

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: 31
Views: 3822

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: 15
Views: 2116

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: 15
Views: 2116

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.
by bart1805
Sat Aug 31, 2019 10:37 pm
Forum: This is SolarChat !!
Topic: H-alpha 31 august, 7 inch Intes, reflections and a BF30.
Replies: 15
Views: 2116

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

The good thing about a slow sun is that it is a good time for experiments! Doublestacking two PST etalons behind the 7 inch Intes went reasonably well, but there still were a lot of reflections. The Circular Polarizer does the job it is supposed to do: not a lot more reflections than when using just...
by bart1805
Sat Aug 31, 2019 10:19 pm
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 25
Views: 10919

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

Very interesting Alex, thanks for posting. What kind of filter were you using as a blue Erf? I am experimenting with a 150mm aluminised Newton (f/8) and a Baader Blue 2 inch CCD. No succes yet...
viewtopic.php?t=25766
by bart1805
Fri Aug 30, 2019 1:51 pm
Forum: Solar Scope Modifications
Topic: Removing mirror’s coating
Replies: 6
Views: 3945

Re: Removing mirror’s coating

I used ferric chloride (40%) for my mirror. Professionals seem to use a solution called green river:
"Green river is a solution consisting of two quarts of distilled water, one quart of hydrochloric acid, and one ounce cupric sulfate."
by bart1805
Wed Aug 28, 2019 4:20 pm
Forum: This is SolarChat !!
Topic: Continuum under 450nm with good seeing
Replies: 14
Views: 2909

Re: Continuum under 450nm with good seeing

Congratulations Alex, you kept the best for the last day! Truly great images!
by bart1805
Thu Aug 22, 2019 2:24 pm
Forum: Solar Scope Modifications
Topic: Is a C8 and a PST mod really usable?
Replies: 10
Views: 11017

Re: Is a C8 and a PST mod really usable?

If you can measure the distance of the focus of the incoming lightcone that is reflected in the 35nm filter you know how far you are from the real focus point of the C8. Optimal distance to the focus point for the front lens of the etalon is 20cm, anything less means that there is substantially more...
by bart1805
Thu Aug 22, 2019 9:30 am
Forum: This is SolarChat !!
Topic: T300 Granuation from St Veran
Replies: 8
Views: 1160

Re: T300 Granuation from St Veran

That looks (even on a phone) amazing! Did you try Christian's Basler with your set up to see if the difference between the 300mm pictures has something to do with the camera?
by bart1805
Tue Aug 20, 2019 7:16 pm
Forum: Solar Scope Modifications
Topic: Is a C8 and a PST mod really usable?
Replies: 10
Views: 11017

Re: Is a C8 and a PST mod really usable?

Hi langleif, luckily vignetting and aperture loss are not the same. If you use the etalon in a 100mm f5 telescope and position the etalon at minus 20cm of the focal point, then there is aperture loss. The systems functions as a 50mm f/10. When using a small etalon on a big f/10 scope, yes there is v...
by bart1805
Sun Aug 18, 2019 8:18 pm
Forum: Solar Scope Modifications
Topic: Blocking Filter In a Collimated Beam?
Replies: 10
Views: 4470

Re: Blocking Filter In a Collimated Beam?

Interesting question Mark! Hope somebody has tested it. In addition to that question: what is the effect in theory of tilting the Blocking filter? Will try it out, but curious what to expect.
by bart1805
Sun Aug 18, 2019 8:14 pm
Forum: This is SolarChat !!
Topic: T300 with an Edmund Optics 394nm
Replies: 9
Views: 1509

Re: T300 with an Edmund Optics 394nm

Nice Alex! Is it a big step forward compared to the predecessor of the T300?
Keep the pictures out of St Veran coming!
by bart1805
Sun Aug 18, 2019 8:12 pm
Forum: Solar Scope Modifications
Topic: Is a C8 and a PST mod really usable?
Replies: 10
Views: 11017

Re: Is a C8 and a PST mod really usable?

Hi langleif, looks nice! Don't understand completely what you are saying. - there is no difference between a 180mm f/10 refractor and a C8 when you look at the light cone. That the light cone is bigger than the etalon means that you are not able to see the whole of the sun. Not that you are using ju...
by bart1805
Wed Aug 14, 2019 7:04 pm
Forum: This is SolarChat !!
Topic: HR granulation with the 300 mm Newtonian - St Véran
Replies: 15
Views: 1862

Re: HR granulation with the 300 mm Newtonian - St Véran

Brilliant Christian! Looked at the Saint Veran website, what a beatiful place.
by bart1805
Wed Aug 14, 2019 6:46 pm
Forum: Solar Scope Modifications
Topic: PST Blocking Filter modification unit by AOKSwiss
Replies: 6
Views: 3350

Re: PST Blocking Filter modification unit by AOKSwiss

Nice! The interesting and new part is the prism with the right thread to screw the BF5 in.
by bart1805
Mon Aug 12, 2019 5:41 am
Forum: This is SolarChat !!
Topic: Two PST etalons doublestacked
Replies: 11
Views: 2383

Re: Two PST etalons doublestacked

Thanks guys! Starry Jack: it is a trade off between resolution and seeing. And if I could choose, I would choose a good seeing. And then image with a green or blue filter. (-; Mark and Stu: problem of uneven illumination will be one of the biggest problems, will let you know if I find something to d...
by bart1805
Sun Aug 11, 2019 6:09 pm
Forum: This is SolarChat !!
Topic: Two PST etalons doublestacked
Replies: 11
Views: 2383

Re: Two PST etalons doublestacked

Thanks Franco, will post here how it evolves. CS! Bart.
by bart1805
Sun Aug 11, 2019 11:38 am
Forum: This is SolarChat !!
Topic: Two PST etalons doublestacked
Replies: 11
Views: 2383

Two PST etalons doublestacked

For some time I am trying to doublestack two PST etalons. Here is more information about the adapter Gerd Neumann made for me and the older experiments: https://solarchatforum.com/viewtopic.php?f=9&t=25524&p=229597&hilit=doublestack#p229597 Two weeks ago the adapter arrived, today first ...
by bart1805
Fri Aug 09, 2019 4:43 pm
Forum: This is SolarChat !!
Topic: Tuesday Sunshine
Replies: 21
Views: 2466

Re: Tuesday Sunshine

Hi Alexandra,
I have still got the original mail I received from Torsten, so if you PM me your mailaddress I will send it to you.
Bart.
by bart1805
Sun Jun 23, 2019 8:37 pm
Forum: This is SolarChat !!
Topic: Moon and Saturn conjunction and a quiet Sun
Replies: 9
Views: 1548

Re: Moon and Saturn conjunction and a quiet Sun

The images of the conjunction are absolutely brilliant! Thanks for posting!
by bart1805
Sun Jun 23, 2019 5:39 pm
Forum: Solar Software
Topic: SharpCap overlaying a rippled filter effect?
Replies: 11
Views: 5011

Re: SharpCap overlaying a rippled filter effect?

Sorry. AS is Autostakkert and AP stands for alignment points.
What you could do is just lay the camera on your desk when connected tot the computer. Aim at a light. Increase gain and decrease exposure time. If I do so there is a grid visible with the asi178mm.
by bart1805
Sun Jun 23, 2019 3:42 pm
Forum: Solar Software
Topic: SharpCap overlaying a rippled filter effect?
Replies: 11
Views: 5011

Re: SharpCap overlaying a rippled filter effect?

Is not that the famous grid pattern seen in a lot of cameras when using high gain and a very short exposure time?
What is the effect of using slightly bigger AP's in AS?
by bart1805
Thu Jun 20, 2019 9:12 am
Forum: This is SolarChat !!
Topic: First solar light for a T300
Replies: 13
Views: 1809

Re: First solar light for a T300

Great image! Is this the successor of the T250?
by bart1805
Tue Jun 18, 2019 10:41 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: ZWO ASI174 remove IR/dust cover removal
Replies: 4
Views: 3222

Re: ZWO ASI174 remove IR/dust cover removal

Can't help you with that, post the question on de ZWO forum, they respond very quickly.
https://bbs.astronomy-imaging-camera.com
by bart1805
Tue Jun 18, 2019 10:12 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: ZWO ASI174 remove IR/dust cover removal
Replies: 4
Views: 3222

Re: ZWO ASI174 remove IR/dust cover removal

I think you can gain about 5mm with the low profile adapter. But then you can't use the protect window of the 174. So you might need an external IR filter, which means you will loose a couple of milimeter again.
Is the cooled or normal version?
by bart1805
Tue Jun 18, 2019 10:02 pm
Forum: This is SolarChat !!
Topic: Saturn, Jupiter last night.
Replies: 11
Views: 1799

Re: Saturn, Jupiter last night.

Beautiful images of Jupiter and Saturn Jozef. Interesting to see if you could get even more out of it when using Registax. The moon pictures are a bit over sharpened and a bit to dark to my taste, but maybe that is because I am a fan of your soft approach when imaging in H-alpha. Really like the way...