Search found 686 matches

by christian viladrich
Mon Aug 17, 2020 7:05 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solar Spectrum and direct connection to a refractor
Replies: 25
Views: 1331

Re: Solar Spectrum and direct connection to a refractor

Hello, I don't know whether this is relevant or not in the discussion, here are some explanations further to the ones provided by Ruppert. Airylab provides two telecentric lenses for the Celestron SC : - one for f/27 - one for f/35. Both share the same front doublet, but differ from the last lens (t...
by christian viladrich
Tue Aug 11, 2020 8:25 am
Forum: This is SolarChat !!
Topic: Does this appear to be overprocessed?
Replies: 14
Views: 333

Re: Does this appear to be overprocessed?

Regarding the difference between image and posted image, it can be reduced by saving the image with a sRGB color profile. Unfortunately, not all browsers use color profiles which can lead to differences in contrast, color or luminosity. On top of that, monitors have their own biais. It could be a go...
by christian viladrich
Tue Aug 11, 2020 8:06 am
Forum: This is SolarChat !!
Topic: CAK and HA images with ARIES D-ERF + C11
Replies: 35
Views: 852

Re: CAK and HA images with ARIES D-ERF + C11

Dear Alfred,
Thinking about it, it would be nice to have an image of the solar limb with the double stacked 1 A Alluxa filters. Just to see what does it look like.
Christian
by christian viladrich
Mon Aug 10, 2020 10:30 am
Forum: This is SolarChat !!
Topic: CAK and HA images with ARIES D-ERF + C11
Replies: 35
Views: 852

Re: CAK and HA images with ARIES D-ERF + C11

Hello Alfred,
You seem to have found the right set up for Ca imaging with the C11.
Did you mean 1 nm or 1 A FWHM for the Alluxa filters ?
by christian viladrich
Mon Aug 10, 2020 10:26 am
Forum: This is SolarChat !!
Topic: AR's 2770 (Light Bridge!), 2769, 2768 in High Res 200mm HA | Full Discs HA, CaK, WL | Aug 9th 2020
Replies: 11
Views: 291

Re: AR's 2770 (Light Bridge!), 2769, 2768 in High Res 200mm HA | Full Discs HA, CaK, WL | Aug 9th 2020

Great shots Marty !

There was some indication of first development of the light bridge on the Ca K image I took on August 7. It only took two days to split this small spot in two !
by christian viladrich
Sun Aug 09, 2020 10:45 am
Forum: This is SolarChat !!
Topic: Ca K images taken on Aug 7 with the 300 mm Newtonian
Replies: 15
Views: 323

Re: Ca K images taken on Aug 7 with the 300 mm Newtonian

Thanks a lot !!

Mark, regarding the efl, I am not sure. In fact, I am looking for FD images taken on August 7th in Ca K to check the scale of the images taken with the N300 in this configuration.
by christian viladrich
Sat Aug 08, 2020 4:06 pm
Forum: This is SolarChat !!
Topic: Ca K images taken on Aug 7 with the 300 mm Newtonian
Replies: 15
Views: 323

Ca K images taken on Aug 7 with the 300 mm Newtonian

Dear All, Seeing is having ups and down up there. Here are two images taken on August 7 with the Alluxa 0.44 nm FWHM filter and the 300 mm Newtonian : AR2770 : http://astrosurf.com/viladrich/astro/soleil/wl/2020/CaK-AR2770-7August2020-7h49mUT-N300-ASI290-Alluxa-150f.jpg Note the lightbridge inside t...
by christian viladrich
Thu Aug 06, 2020 5:33 pm
Forum: This is SolarChat !!
Topic: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet
Replies: 19
Views: 458

Re: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet

Thanks to all ! Sorry for my slow answer ... we have a slow Internet connection. There is not much activity, so I have seen no filament with this ca K filter. On top of that, the FWHM is probably too large. 1.5A FHWM would be more appropriated. The two filters (EO394-10 nm and Alluxa Ca K) are stack...
by christian viladrich
Wed Aug 05, 2020 5:32 pm
Forum: SPoD Archive
Topic: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet
Replies: 15
Views: 236

Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet

Dear All, Here is my first ever Ca K image taken with the 300 mm solar Newtonian telescope. The seeing was far from perfect, still there is a huge increase in resolution compared to the images taken with my 150 mm TOA refractor. A very different world opens to itself. A lot of detail is visible insi...
by christian viladrich
Wed Aug 05, 2020 5:32 pm
Forum: This is SolarChat !!
Topic: Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet
Replies: 19
Views: 458

Ca K image taken on August 2 with the 300 mm solar telescope - best resolution yet

Dear All, Here is my first ever Ca K image taken with the 300 mm solar Newtonian telescope. The seeing was far from perfect, still there is a huge increase in resolution compared to the images taken with my 150 mm TOA refractor. A very different world opens to itself. A lot of detail is visible insi...
by christian viladrich
Tue Jul 28, 2020 9:02 am
Forum: This is SolarChat !!
Topic: Sol from the 27th of July 2020.
Replies: 13
Views: 425

Re: Sol from the 27th of July 2020.

Nice shots Eric !
by christian viladrich
Tue Jul 28, 2020 9:02 am
Forum: This is SolarChat !!
Topic: AR2767 + a new mini sunspot
Replies: 11
Views: 403

Re: AR2767 + a new mini sunspot

Let's hope there is a big one just behind...
by christian viladrich
Mon Jul 27, 2020 8:43 pm
Forum: This is SolarChat !!
Topic: AR 2767 in Ca K Alluxa with the TOA 150
Replies: 11
Views: 383

Re: AR 2767 in Ca K Alluxa with the TOA 150

Thanks to all ! Mark : yes indeed, the exposure time is pretty short thanks to the high transmission of the filter. I have tuned a little bit the set-up with the EO394 on a tilt mount to reject some internal reflection, and the Alluxa filter also on another tilt mount to tune it on Ca K. Alexandra :...
by christian viladrich
Mon Jul 27, 2020 8:39 pm
Forum: This is SolarChat !!
Topic: July 27 2020. Awaiting a new active region
Replies: 12
Views: 427

Re: July 27 2020. Awaiting a new active region

SDO/AIA is showing quite a firework on the east limb !
by christian viladrich
Mon Jul 27, 2020 8:37 pm
Forum: SPoD Archive
Topic: AR2767 in High Res II | HA, CaK, Gband Trifecta | July 27th 2020
Replies: 13
Views: 323

Re: AR2767 in High Res II | HA, CaK, Gband Trifecta | July 27th 2020

Hi Marty,
The 3-band animation is very interesting !
by christian viladrich
Mon Jul 27, 2020 8:33 pm
Forum: This is SolarChat !!
Topic: AR2767 in Ca K on July 27 with the TOA 150
Replies: 12
Views: 415

AR2767 in Ca K on July 27 with the TOA 150

Hi,
AR2767 is on its journey accross the solar disk. The seeing was awfull due to very warm weather. Still I was lucky with a very short episode of good seeing :

Image

Clear skies
by christian viladrich
Sun Jul 26, 2020 8:11 pm
Forum: This is SolarChat !!
Topic: AR 2767 in Ca K Alluxa with the TOA 150
Replies: 11
Views: 383

AR 2767 in Ca K Alluxa with the TOA 150

Hi, At last, we have some activity on the Sun : http://astrosurf.com/viladrich/astro/soleil/wl/2020/CaK-AR2767-25july2020-TOA150-Alluxa-ASI290-90f.jpg And an image near the center of the solar disk : http://astrosurf.com/viladrich/astro/soleil/wl/2020/CaK-center-25July2020-8h45mUT-Alluxa-ASI290-120f...
by christian viladrich
Sun Jul 19, 2020 4:47 pm
Forum: This is SolarChat !!
Topic: Sun in Ha and Ca II K plus beautiful eruptive prom 12th July 2020
Replies: 19
Views: 657

Re: Sun in Ha and Ca II K plus beautiful eruptive prom 12th July 2020

Beatifull set of images an animation. Well done Stuart !
by christian viladrich
Sun Jul 19, 2020 4:45 pm
Forum: This is SolarChat !!
Topic: C11 HA + CAK Imaging - Got rid of reflected light!!
Replies: 21
Views: 920

Re: C11 HA + CAK Imaging - Got rid of reflected light!!

Hi Alfred,
This is great news you finally solved this issue !
by christian viladrich
Sun Jul 19, 2020 4:41 pm
Forum: This is SolarChat !!
Topic: Sol from the 18th of July 2020.
Replies: 6
Views: 276

Re: Sol from the 18th of July 2020.

Hello Eric,
Blank Sun but great shots !
Christian
by christian viladrich
Sun Jul 19, 2020 4:39 pm
Forum: Solar Reference Library
Topic: Filter measurements data base
Replies: 8
Views: 1380

Filter measurements data base

Hi, I don't know whether this is the right place to post this ... We (Fred Jabet, Alexander Lhoest and myself) have measured a number of filters with a spectrometer from 300 to 1050 nm: http://astrosurf.com/viladrich/astro/instrument/filters/Filters.html This is not specific to solar astronomy, but ...