Search found 518 matches

by christian viladrich
Mon Jun 03, 2019 6:14 pm
Forum: Solar Astronomy Shop and Swap
Topic: Wanted : Lumicon prominence solar filter
Replies: 0
Views: 65

Wanted : Lumicon prominence solar filter

Hello,
I am looking for a Lumicon prominence solar filter.
Thanks !
Christian
by christian viladrich
Sun Jun 02, 2019 9:16 am
Forum: Solar Astronomy Shop and Swap
Topic: "Astronomie Solaire" - New (French) book on Solar Observation now available
Replies: 18
Views: 1519

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

Hello Ronnie,
We are still on track for next Christmass :-)
Best regards
Christian
by christian viladrich
Wed May 22, 2019 6:52 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: cak present and past
Replies: 18
Views: 366

Re: cak present and past

I love these old plates. Well done !
by christian viladrich
Wed May 22, 2019 6:51 pm
Forum: Solar Scope Modifications
Topic: 150 mm Solar Newton
Replies: 50
Views: 1625

Re: 150 mm Solar Newton

Hello Bart,
I like your filter support system :-)
I have made no progress on my side since I was busy on other things. I've got to get into this in June.
BTW, did you observe any temperature issue with the filter ?
Best regards
Christian
by christian viladrich
Sat May 11, 2019 9:17 am
Forum: This is SolarChat !!
Topic: AR2740 and 2741 in CaK, 09052019
Replies: 11
Views: 236

Re: AR2740 and 2741 in CaK, 09052019

So did you find a significant improvement ?
by christian viladrich
Sat May 11, 2019 9:16 am
Forum: This is SolarChat !!
Topic: AR2740 & 2741 in Ha with the C8 EdgeHD on May 10
Replies: 8
Views: 198

Re: AR2740 & 2741 in Ha with the C8 EdgeHD on May 10

Thanks guys :-)

The F/35 gives a narrower effective bandpass. The effective bandpass of a 0.3 A filter is about 0.5A at F/27 and 0.4A at F/35 :
Image
I have a test image comparing both F-ratio somewhere on my website.
by christian viladrich
Sat May 11, 2019 9:12 am
Forum: This is SolarChat !!
Topic: Early Doors 11/5/2019
Replies: 7
Views: 141

Re: Early Doors 11/5/2019

Excellent indeed !
by christian viladrich
Sat May 11, 2019 9:11 am
Forum: This is SolarChat !!
Topic: May 10th Spots
Replies: 13
Views: 204

Re: May 10th Spots

Beautifull images and processing !
by christian viladrich
Fri May 10, 2019 8:39 pm
Forum: This is SolarChat !!
Topic: Quick session this morning May 7th
Replies: 23
Views: 403

Re: Quick session this morning May 7th

Nice set of images ! You can probably remove the 0.7 reducer next time.
by christian viladrich
Fri May 10, 2019 8:37 pm
Forum: This is SolarChat !!
Topic: Animation: Cinco de Mayo Fireworks
Replies: 14
Views: 246

Re: Animation: Cinco de Mayo Fireworks

Well done Christophe !
It looks as if the large prominence on the limb has some connection with some of the filaments from the sunspot ?
by christian viladrich
Fri May 10, 2019 8:33 pm
Forum: This is SolarChat !!
Topic: AR2740 and 2741 in CaK, 09052019
Replies: 11
Views: 236

Re: AR2740 and 2741 in CaK, 09052019

Well done Bart !
Is it with the change of distance between the lenses ?
by christian viladrich
Fri May 10, 2019 8:31 pm
Forum: This is SolarChat !!
Topic: First attempt at an animation
Replies: 14
Views: 267

Re: First attempt at an animation

This s quite a good start. On top of that the rotation on the solar sphere is visible.
What is the parameter you didn't find ?
by christian viladrich
Fri May 10, 2019 8:26 pm
Forum: This is SolarChat !!
Topic: A late afternoon bonus - 9 May 2019
Replies: 12
Views: 213

Re: A late afternoon bonus - 9 May 2019

Very nice disk indeed. The processing is very good.
May I suggest an orientation with the North to the top ?
by christian viladrich
Fri May 10, 2019 8:23 pm
Forum: This is SolarChat !!
Topic: Friday May 10th
Replies: 9
Views: 212

Re: Friday May 10th

Nice set of images !
by christian viladrich
Fri May 10, 2019 8:20 pm
Forum: This is SolarChat !!
Topic: AR2740 & 2741 in Ha with the C8 EdgeHD on May 10
Replies: 8
Views: 198

AR2740 & 2741 in Ha with the C8 EdgeHD on May 10

Hello, This morning the large passing cumulus kept respectfully at a distance of the Sun for at least 2 hours. This was quite unexpected since the forecast said it was going to rain. The current two sunspots are pretty small though the surrounding activity gave nice views. http://astrosurf.com/vilad...
by christian viladrich
Fri May 10, 2019 6:31 pm
Forum: Solar Scope Modifications
Topic: Removing new Mods
Replies: 23
Views: 561

Re: Maksutov 180/1800 Modification?

Hi, The rationale is as follows : - Let's call F and D the focal length and diameter of the telescope. For your Mak F/D = 10. - Let's call d the diameter of the etalon and of the collimating lens. We will come back latter to the case where the diameters of etalon and lens are different. - Let's call...
by christian viladrich
Sat May 04, 2019 7:51 pm
Forum: This is SolarChat !!
Topic: Sub Aperture ERF Options For Quarks
Replies: 5
Views: 160

Re: I know there are cheap and expensive

There is no free lunch the saying goes :-)
by christian viladrich
Thu May 02, 2019 11:44 am
Forum: Solar Scope Modifications
Topic: Options for high resolution?
Replies: 18
Views: 585

Re: Options for high resolution?

I would say basically the same as Marty and Valery, A 100-150 mm refractor is very easy to set up and operate. This is no need to check collimation. Usually, the seeing is fine with this range of aperture. With a 200 mm and above, you will be more dependant on seeing condition, proper collimation, e...
by christian viladrich
Fri Apr 26, 2019 1:07 pm
Forum: This is SolarChat !!
Topic: Quiet Sun Ha Chromosphere 250mm RCT
Replies: 13
Views: 348

Re: Quiet Sun Ha Chromosphere 250mm RCT

This is quite good Stu ! I found the processing very well balanced. You just need now to keep the 250 RC ready as often as possible in order to be there for the good seeing episodes.
BTW, could you share a pic or two of the Lunt mounted on the 250 RC ?
by christian viladrich
Thu Apr 25, 2019 11:52 am
Forum: Solar Scope Modifications
Topic: help with stuck threads
Replies: 11
Views: 305

Re: help with stuck threads

You can try some drops of teflon oil. Wait one or two days after you drop the oil, then try again.
by christian viladrich
Wed Apr 24, 2019 12:37 pm
Forum: This is SolarChat !!
Topic: Lunt CaK module testing 22nd April
Replies: 24
Views: 565

Re: Lunt CaK module testing 22nd April

Thanks Bob, I'd completely forgot this one too !
It seems that one (or even both) of the ERF can be replaced with a EO394-10 nm in 50 mm diameter which much benefit.
by christian viladrich
Mon Apr 22, 2019 8:25 pm
Forum: This is SolarChat !!
Topic: Lunt CaK module testing 22nd April
Replies: 24
Views: 565

Re: Lunt CaK module testing 22nd April

There is definitely a problem there. It is worth asking TS guys.
by christian viladrich
Mon Apr 22, 2019 5:22 pm
Forum: This is SolarChat !!
Topic: 9 inch Rumak: granulation and AR2738
Replies: 16
Views: 372

Re: 9 inch Rumak: granulation and AR2738

Excellent first light !
A 10"ERF might be of use for this scope.
by christian viladrich
Sun Apr 21, 2019 7:08 pm
Forum: This is SolarChat !!
Topic: From Monday 15 April - Zooming in on the spot
Replies: 5
Views: 147

Re: From Monday 15 April - Zooming in on the spot

The processing of the second image is quite good.
We were lucky to have this nake eye sunspot.
by christian viladrich
Sun Apr 21, 2019 7:05 pm
Forum: This is SolarChat !!
Topic: 13 April Ca K FD image
Replies: 9
Views: 205

Re: 13 April Ca K FD image

Thanks to all !
The seeing conditions were rather good on that day.