Search found 437 matches

by christian viladrich
Mon Nov 12, 2018 7:21 pm
Forum: This is SolarChat !!
Topic: I told ya so... Comets causing sunspots.
Replies: 7
Views: 206

Re: I told ya so... Comets causing sunspots.

I am afraid sunspots are the effect of localized strong magnetic fields in the photosphere (and in the layer below).
They have nothing to do with comets.
by christian viladrich
Sun Nov 11, 2018 8:31 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Interesting info Raf :-)
I didn't know they have these small size Cassegrain scopes.They have quartz mirrors which is very nice. I have no idea of the optical quality.
by christian viladrich
Sun Nov 11, 2018 7:16 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Hello Bob, Here are the simulations for a re-spaced classic C8 : http://astrosurf.com/viladrich/astro/instrument/sensitivity/sensitivity-analysis-SC8-Plate.htm The diffraction limited flat-field increases by a factor of four when the Schmidt plate position is set 230mm ahead its nominal position. ht...
by christian viladrich
Fri Nov 09, 2018 7:46 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Hi Bob,
Is this the C8 or the C8 EdgeHD ?
by christian viladrich
Thu Nov 08, 2018 8:08 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 43
Views: 1134

Re: Mg II in UltraViolet

Hi Bob,
I have done some simulations there for a re-spaced C14 :
http://astrosurf.com/viladrich/astro/in ... -Plate.htm
I can run some more for the C8 if it is helpfull.
Christian
by christian viladrich
Wed Nov 07, 2018 8:49 pm
Forum: This is SolarChat !!
Topic: Astronomie solaire
Replies: 12
Views: 417

Re: Astronomie solaire

Hi,
We will keep you informed when the English version is ready.
by christian viladrich
Mon Nov 05, 2018 7:40 pm
Forum: This is SolarChat !!
Topic: Astronomie solaire
Replies: 12
Views: 417

Re: Astronomie solaire

Thanks Ralf and Pedro for your kind comments :-)

This give us even more motivation to get the English version ready ASAP.

Best regards
Christian
by christian viladrich
Tue Oct 30, 2018 7:22 pm
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 14
Views: 414

Re: My New BinChannel ERF

40 nm FWHM in both Ca K and Ha is amazing. What far goes the blockage in IR ? 1000 nm ? 1200 nm ?

Any idea of the optical quality (P-V or rms wavefront) ?
by christian viladrich
Mon Oct 29, 2018 9:28 pm
Forum: Solar Scope Modifications
Topic: My New BinChannel ERF
Replies: 14
Views: 414

Re: My New BinChannel ERF

Looks good !
Any idea of the optical quality ? Any transmission curve available ?
by christian viladrich
Sun Oct 28, 2018 9:18 pm
Forum: This is SolarChat !!
Topic: Sun Exhibition - London Science Museum
Replies: 9
Views: 198

Re: Sun Exhibition - London Science Museum

Very interesting :-)
I am planning a visit there in January.
Christian
by christian viladrich
Wed Oct 24, 2018 9:12 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: BF30 ITF replacement
Replies: 15
Views: 705

Re: BF30 ITF replacement

Hello Bob,
Thanks for the valuable information.
What is the orginal source of information for these figures :
download/file.php?id=34786
Thanks !
by christian viladrich
Mon Oct 22, 2018 7:31 am
Forum: This is SolarChat !!
Topic: Very Long ferret! 10-21-2018
Replies: 9
Views: 298

Re: Very Long ferret! 10-21-2018

Hello Apollo
Could you give data / hour of observation ?
Best regards
Christian
by christian viladrich
Sat Oct 20, 2018 8:39 am
Forum: This is SolarChat !!
Topic: image de-rotation?
Replies: 6
Views: 216

Re: image de-rotation?

You can use Autostakkert. It can correct the rotation of images taken with an altazimutal mount.
by christian viladrich
Mon Oct 15, 2018 6:48 pm
Forum: This is SolarChat !!
Topic: Help Diagnose an SCT?
Replies: 24
Views: 672

Re: Help Diagnose an SCT?

Back to the C8 Edge-HD, the optical quality is much better than the optical quality of these vintage SC...I started a long time ago with an orange tube C8 ... The C8 Edge-HD is an excellent balance between portability, ease of use, optical quality and resolution. The only drawback is that you need a...
by christian viladrich
Mon Oct 15, 2018 6:41 pm
Forum: This is SolarChat !!
Topic: Help Diagnose an SCT?
Replies: 24
Views: 672

Re: Help Diagnose an SCT?

Hello Marty, Thanks for taking the time of takin in/out focus images. This is helpfull. We can see the following things : - There is a very significant level of spherical aberration. It could be because the thermal balance of the optics was not reached, or the optics are really bad, or both. - The t...
by christian viladrich
Sat Oct 13, 2018 4:42 pm
Forum: Solar Scope Modifications
Topic: Dismantling and modification of a PST CaK
Replies: 32
Views: 1292

Re: Dismantling and modification of a PST CaK

So, finally there are two filters : - Number 2 at the rear. Actually it consists in two parts (glued ?). - Number one at the front (behind the lens ?), this one is a GG395 according to the information given by Apollo. Is this correct ? No filter at the front of the eyepice ? BTW, the lens seems to b...
by christian viladrich
Sat Oct 13, 2018 4:32 pm
Forum: This is SolarChat !!
Topic: The hydrogen cork, and the solar ghost by Apollo Lasky
Replies: 11
Views: 386

Re: The hydrogen cork, and the solar ghost by Apollo Lasky

Hello Apollo,
Here is a full disk movie of the event :
https://gong2.nso.edu/products/scaleVie ... uctIndex=0
Your movie is much more impressive !
by christian viladrich
Sat Oct 13, 2018 3:23 pm
Forum: This is SolarChat !!
Topic: Help Diagnose an SCT?
Replies: 24
Views: 672

Re: Help Diagnose an SCT?

Hello Marty, A a comparison, here is an image of Copernic region taken by Gerard Therin with his 260 mm telescope : http://www.naturepixel.com/as/2017_09_14_0402_stadius_copernic_hortensius_kepler_vmc260l_asi178mm_g_as3_r6_cc_copyright.jpg To be honest, Gérad is among the best lunar imagers. My poin...
by christian viladrich
Sat Oct 13, 2018 12:21 pm
Forum: Solar Scope Modifications
Topic: Dismantling and modification of a PST CaK
Replies: 32
Views: 1292

Re: Dismantling and modification of a PST CaK

Just wondering whether you could apply some heat arround filter n1 ? Maybe there is some glue ?
by christian viladrich
Fri Oct 12, 2018 8:02 pm
Forum: This is SolarChat !!
Topic: Help Diagnose an SCT?
Replies: 24
Views: 672

Re: Help Diagnose an SCT?

Hello Marty, This is an interesting case :-) Let's start with the resolution of the lunar and planetary images. They are far from beeing on pair with what a 10" telescope can give. This leads us to the question of seeing and / or optical quality of the telescope. The simple question is do you see th...
by christian viladrich
Fri Oct 12, 2018 8:02 pm
Forum: Solar Astronomy Shop and Swap
Topic: "Astronomie Solaire" - New (French) book on Solar Observation now available
Replies: 18
Views: 608

Re: "Astronomie Solaire" - New (French) book on Solar Observation now available

Thanks guys :-)

So, we have to get working to get this English version available ASAP ;-)