Search found 3600 matches

by Valery
Tue May 11, 2021 7:47 am
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 16
Views: 4322

Re: Lunt LS50THa modification to 200 mm aperture

Here is the Filip's sun image I was able to restore.

Some better focusing, more frames in the movie and some more clever hunting for seeing moments, less noisy camera and the results can be way better.


Valery
by Valery
Mon May 10, 2021 1:06 pm
Forum: Solar Scope Modifications
Topic: H alpha filter as ERF?
Replies: 21
Views: 314

Re: H alpha filter as ERF?

I am also interested in your ERF, do you have a link where I can find out more about them? Thanks again. We do not produce such small filters. 140mm is the smallest model and only if we gazered a full batch (8 pc). BTW Still, I advice you to buy a full aperture DERF of 100mm size. There are plenty ...
by Valery
Thu May 06, 2021 8:23 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarSpectrum?
Replies: 29
Views: 744

Re: SolarSpectrum?

Alexandra, Don't listen to all sceptics. Let them be limited to any smaller apertures they consider comfortable for them. Earlier or later you will outresolve all your problems with an imaging rig, telescope collimation keeping, best seeing moments capturing. Only those reach the goal who believe an...
by Valery
Tue May 04, 2021 4:00 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarSpectrum?
Replies: 29
Views: 744

Re: SolarSpectrum?

Alexandra, The optics in your telescope looks very good (when I look at the off focus images), significantly better than in my own C11. The collimation you can check by looking at the star image. It must be concentric. This all. Excellent seeing like 5/5 is not necessary for lucky imaging technique....
by Valery
Sat May 01, 2021 6:04 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarSpectrum?
Replies: 29
Views: 744

Re: SolarSpectrum?

Alexandra, Your PST mod may not work well due to improper BF filtration. When I tried to use Lunt B1200 with PST etalon it does not work. Contrast is quite low. As soon as I placed in the imaging rig a BF10 (Coronado) or PST's native BF5, the contrast becomes high - as it was in the PST scope. May b...
by Valery
Thu Apr 08, 2021 7:03 pm
Forum: This is SolarChat !!
Topic: H alpha prominence from April 6
Replies: 14
Views: 203

Re: H alpha prominence from April 6

Hi Peter,

Fantastic prominence animation! Thanks for sharing.


Valery
by Valery
Thu Apr 08, 2021 7:03 pm
Forum: SPoD Archive
Topic: H alpha prominence from April 6
Replies: 14
Views: 75

Re: H alpha prominence from April 6

Hi Peter,

Fantastic prominence animation! Thanks for sharing.


Valery
by Valery
Wed Mar 17, 2021 4:19 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Excellent. Thanks for sharing ! In addition to the image of yours and Bob's images, here is another comparison. First one with a 0.37 A FWHM Ca K filter : http://astrosurf.com/viladrich/astro/soleil/wl/2020/CaK-31May2020-8h40minUT-limb-Alluxa-TOA150-ASI290.jpg Then a 0.24 nm FWHM : http://astrosurf...
by Valery
Sat Feb 27, 2021 4:14 pm
Forum: This is SolarChat !!
Topic: AR2804 in High Res | Feb 26th 2021
Replies: 18
Views: 281

Re: AR2804 in High Res | Feb 26th 2021

There I had once so far 0.8 in one week and usually 1.2 to 1.4. I also take a video of the sun with the C8 to have a visual archive of the daily seeing. It seems that the jet-stream in my area is relatively kind, but I need much longer statistics for conclusions as you say. 1) Regarding ERFs, I hav...
by Valery
Thu Feb 25, 2021 9:45 pm
Forum: Solar Scope Modifications
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 32
Views: 1572

Re: blocking filter chit chat chop chop - lets cut it out.

Using the aries d-erf is extremely awesome to everyone and I really do wish we all could have them, but its cost combined with a good rear mounted etalon like a solar spectrum and C11; Would you be willing to perform a test on the solar limb using just your Pst etalon? If your andover filters remov...
by Valery
Thu Feb 25, 2021 7:57 am
Forum: Solar Scope Modifications
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 32
Views: 1572

Re: blocking filter chit chat chop chop - lets cut it out.

These two filters seem very far off band and suspect this to be reason for the negative experience using them. These filters were designed for F/5 cone and they stay on band in both my SW F/5 refractors. I will try them again with more transparent Quark. Hope they will work better in a such combina...
by Valery
Tue Feb 23, 2021 10:23 pm
Forum: Solar Scope Modifications
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 32
Views: 1572

Re: blocking filter chit chat chop chop - lets cut it out.

Here the profiles of two Andover 12.5mm 0.1nm filters designed to work with F/5 telescopes (include both my SW F/5 100mm and 150mm.
by Valery
Tue Feb 23, 2021 6:23 am
Forum: Solar Scope Modifications
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 32
Views: 1572

Re: blocking filter chit chat chop chop - lets cut it out.

Been there, done this - several years ago with exactly the same Andover, but with 12.5mm filters - of the same size as front BF in a standard Quark. Tried with Quarks. No gain at all, just makes a picture much dimmer and much less uniform than in original Quarks. These filters were constructed for F...
by Valery
Tue Jan 26, 2021 2:25 pm
Forum: This is SolarChat !!
Topic: 25Jan HA Sun from Singapore
Replies: 18
Views: 670

Re: 25Jan HA Sun from Singapore

Thanks, Valery. The Quark is still doing well. Its electronic components have a life duration and I hope it can last Cycle 25. Alfred I got one very nice 0.4A Quark wich is 5 year old now. It doing well and I keep it always with a dessictant in it's plastic barrel and use it only when the seeing is...
by Valery
Mon Jan 25, 2021 9:58 pm
Forum: This is SolarChat !!
Topic: 25Jan HA Sun from Singapore
Replies: 18
Views: 670

Re: 25Jan HA Sun from Singapore

Nice images, Alfred

Hope you will catch better seeing and make even better images.


Valery
by Valery
Mon Jan 25, 2021 9:45 pm
Forum: This is SolarChat !!
Topic: Monday Sun Jan 25th 2021
Replies: 25
Views: 1316

Re: Monday Sun Jan 25th 2021

Great high res images include CaK !

Valery
by Valery
Wed Dec 23, 2020 3:00 pm
Forum: This is SolarChat !!
Topic: Testing a Calcium corrector on a C11 (Image with Alluxa+Chroma filters added 29Dec)
Replies: 34
Views: 967

Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

To be strict, such a device can’t be a true corrector. True corrector is not a kind of a cheep Barlow lens with a build in some negative (to SCT) spherical aberration - too many factors out of control. As soon as I will back home after Covid 19, I will post images in CaK with a true ccorrector. Rega...
by Valery
Wed Dec 23, 2020 3:00 pm
Forum: SPoD Archive
Topic: Testing a Calcium corrector on a C11 (New image added 26Dec)
Replies: 23
Views: 275

Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

To be strict, such a device can’t be a true corrector. True corrector is not a kind of a cheep Barlow lens with a build in some negative (to SCT) spherical aberration - too many factors out of control. As soon as I will back home after Covid 19, I will post images in CaK with a true ccorrector. Rega...
by Valery
Wed Dec 23, 2020 8:09 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Sony IMX253 mono cameras
Replies: 35
Views: 1339

Re: Sony IMX253 mono cameras

Hi Bob, Unfortunately, CMOS. Still far behind CCD. in terms of S/N. Since 2017 I was not able to find camera which was close to. PGR ICX445 mono CCD. 200 - 400 frames give much better S/N. Than 4000 frames Basler 1920-155. Use Basler. Due to high fps and more optimal sampling only. Look at Christian...
by Valery
Thu Dec 03, 2020 6:51 am
Forum: This is SolarChat !!
Topic: AR 2786 surrounded by waves (New images added on 6Dec)
Replies: 23
Views: 614

Re: AR 2786 surrounded by waves

Hi Alfred,

This image of the nice AR2786 is fantastic.


Valery
by Valery
Thu Dec 03, 2020 6:51 am
Forum: SPoD Archive
Topic: AR 2786 surrounded by waves
Replies: 6
Views: 185

Re: AR 2786 surrounded by waves

Hi Alfred,

This image of the nice AR2786 is fantastic.


Valery
by Valery
Mon Nov 30, 2020 6:51 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Daystar Quark - Help in determining "on band" operation
Replies: 9
Views: 591

Re: Daystar Quark - Help in determining "on band" operation

Hi Valery, The scope is a Celestron 80ED, native f/D is 7.5 With the 4.2X telecentric barlow embedded in the Quark, the etalon should work at around f/D=31.5 The Quark I am using was pulled out of a Daystar Solar Scout SS60 As a side note and to make a comparison, I ran the calculation in reverse f...
by Valery
Sat Nov 28, 2020 9:53 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Daystar Quark - Help in determining "on band" operation
Replies: 9
Views: 591

Re: Daystar Quark - Help in determining "on band" operation

Hello, As suggested by a number of members of the forum, today I invested 3.5 hours to test almost all the settings of the adjustment knob of my Daystar quark. All the images were obtained by stacking 25% of the best shots in a 1k frame .ser file; exposure 10 ms, focus unchanged, took a flat field ...
by Valery
Fri Nov 27, 2020 8:55 am
Forum: This is SolarChat !!
Topic: Nov. 26, 2020 AR 2786 and 2785
Replies: 15
Views: 377

Re: Nov. 26, 2020 AR 2786 and 2785

Excellent results, Phil!

Thanks for sharing them with us.


Valery