Search found 82 matches

by LTHB
Wed Aug 07, 2019 7:11 pm
Forum: This is SolarChat !!
Topic: FD 07-08
Replies: 10
Views: 119

Re: FD 07-08

Nice disk!

This afternoon I was also looking for the two small active regions that GONG showed on pictures taken in the morning, but couldn't find anything in h alpha.
by LTHB
Wed Aug 07, 2019 7:06 pm
Forum: This is SolarChat !!
Topic: Cak Chromosphere
Replies: 12
Views: 191

Re: Cak Chromosphere

Really nice CaK picture, Stu!

Pixinsight is on my list of future projects, too! In particular I'd like to try the different options for deconvolution that PI offers and see if they help improving solar images. Did you do deconvolution in PI?

Frank
by LTHB
Wed Aug 07, 2019 6:58 pm
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 187

Re: CaK – 30th July

Thanks, Brian, Stu and Maurits! Christian, a thermal probe is an interesting idea, but the Mewlon does not have any openings for a cable to pass through. My idea was to use a thermal imaging camera that can measure surface temperatures; I may have access to one, so probably I will try that in the ne...
by LTHB
Thu Aug 01, 2019 1:00 am
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 187

Re: CaK – 30th July

Thanks, Mark&Alexandra! Alexandra, the Mewlon is an uncorrected Dall Kirkham, so tack-sharp on axis, but showing coma off-axis. Even on the rather small sensor of the ASI174 you see it if you are looking closely in the corners, as you did. The asymmetry (top left vs. bottom right) is the result of m...
by LTHB
Wed Jul 31, 2019 8:47 am
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 187

CaK – 30th July

Once again an almost quiet solar surface in CaK, taken yesterday afternoon during a stretch of (for my location) exceptionally good seeing: https://live.staticflickr.com/65535/48420767656_aafa887925_o.jpg A resampled version (150%): https://live.staticflickr.com/65535/48420916337_4bc803e25f_o.jpg Fu...
by LTHB
Tue Jul 30, 2019 9:01 pm
Forum: This is SolarChat !!
Topic: CaK - 28th July
Replies: 7
Views: 140

Re: CaK - 28th July

Thanks folks!

Mark, the scope was the Mewlon 210, double stacked Coronado filters, ASI174. I'm still fiddling with this combination, trying to understand when and why it does or doesn't work

Frank
by LTHB
Mon Jul 29, 2019 8:12 pm
Forum: This is SolarChat !!
Topic: Monday Sunshine 29th July
Replies: 9
Views: 146

Re: Monday Sunshine 29th July

Nice set, Mark!
by LTHB
Mon Jul 29, 2019 8:07 pm
Forum: This is SolarChat !!
Topic: CaK - 28th July
Replies: 7
Views: 140

CaK - 28th July

I‘m a bit late with my CaK, after Alexandra‘s and Mark's marvelous images, but I thought I‘d post it anyway. I often find it instructive to compare different pictures of (almost) the same target to see what different image scales reveal and how much (or how little) difference the local sky condition...
by LTHB
Mon Jul 29, 2019 2:17 pm
Forum: This is SolarChat !!
Topic: Solar Sunday
Replies: 22
Views: 351

Re: Solar Sunday

Top-notch CaK image! Not over-sharpened and very contrasty, really great!
by LTHB
Wed Jul 24, 2019 6:09 pm
Forum: This is SolarChat !!
Topic: CaK – 23rd July
Replies: 9
Views: 179

Re: CaK – 23rd July

Thanks, folks! Mark, I bought the Chroma filter here: https://optcorp.com/products/chroma-blue-filters The transmission graph shows that the filter opens around 360nm and is definitely wide open at 390nm. The same graph can be found in Chroma's flyer (p.4): https://www.chroma.com/sites/default/files...
by LTHB
Wed Jul 24, 2019 11:33 am
Forum: This is SolarChat !!
Topic: Brief Sunshine on the 23rd July
Replies: 8
Views: 144

Re: Brief Sunshine on the 23rd July

Nice close-up!

Good luck with the weather! Meteoblue's seeing predictions for tomorrow are quite good, so maybe a chance for high-res imaging!

Regards,

Frank
by LTHB
Wed Jul 24, 2019 11:24 am
Forum: This is SolarChat !!
Topic: CaK – 23rd July
Replies: 9
Views: 179

CaK – 23rd July

Blue skies here yesterday, but Meteoblue predicted a seeing worse than 2 arcseconds, so I decided to do some testing and tinkering with my CaK setup. After setting up, however, seeing turned out to be much better, with some moments around 0.8“ and better. Unfortunately I had taken out my 90mm scope ...
by LTHB
Fri Jul 05, 2019 6:06 am
Forum: This is SolarChat !!
Topic: Spicules and dark mottles in h alpha, June 28th
Replies: 9
Views: 293

Re: Spicules and dark mottles in h alpha, June 28th

Thanks, folks!

Alexandra, your tutorial has been useful for me a couple of times, thanks!

Frank
by LTHB
Sat Jun 29, 2019 11:43 pm
Forum: This is SolarChat !!
Topic: Spicules and dark mottles in h alpha, June 28th
Replies: 9
Views: 293

Spicules and dark mottles in h alpha, June 28th

Finally an afternoon of blue skies, after weeks of milky haze and clouds, so an opportunity to try out a new filter and also a Photoshop tool I've never used before (following a hint I found in Alexandra‘s solar imaging tutorial), namely Shadows/Highlights. Seeing was okay to nice, and after lots of...
by LTHB
Thu May 30, 2019 7:15 pm
Forum: Solar Scope Modifications
Topic: Creative Solutions to the Problem of LARGE (8"+) ERF Cells
Replies: 9
Views: 698

Re: Creative Solutions to the Problem of LARGE (8"+) ERF Cells

It would certainly be great to have a supplier for large filter cells, but my experience with JTW Astronomy (trying to purchase a spectroscope from them) makes me sceptical that they will be a reliable producer. In any case I would never again make any down payment when ordering from them. Regards, ...
by LTHB
Tue May 21, 2019 3:19 pm
Forum: This is SolarChat !!
Topic: Solarchat forum extended 3 more years...
Replies: 12
Views: 575

Re: Solarchat forum extended 3 more years...

Yes, great news to have the best source of info for solar nuts on this planet for at least three more years! Thanks, Stephen!

Frank
by LTHB
Wed May 08, 2019 5:32 pm
Forum: This is SolarChat !!
Topic: May 7: H alpha and CaK
Replies: 11
Views: 396

Re: May 7: H alpha and CaK

Very nice pictures, very good resolution! Just what I would have LIKED to get yesterday, with clear blue skies over here, if the seeing hadn't been that [censored]... One question, if I may: You are using the 115mm refractor for CaK, not the C8 - is this for seeing reasons? I am asking because my ex...
by LTHB
Sun May 05, 2019 8:51 pm
Forum: This is SolarChat !!
Topic: Commercially Available Filter Cells For LARGE ERF's
Replies: 27
Views: 1517

Re: Commercially Available Filter Cells For LARGE ERF's

+1 for a Teleskop-Express filter cell for the 8" Aries-ERF. I got one for my Mewlon 210 (just like Marty's cell, but with a few milimeters more clear aperture) : https://www.teleskop-express.de/shop/pr ... 161mm.html

Frank
by LTHB
Wed Apr 10, 2019 12:01 pm
Forum: This is SolarChat !!
Topic: Saturday Sun 6th April
Replies: 15
Views: 546

Re: Saturday Sun 6th April

Valery, your observation that seeing is best between 20 and 30 degrees agrees with my results in the last couple of days - I will try to confirm if that holds generally for my location, too. Is there an obvious reason/explanation for that?
by LTHB
Wed Apr 10, 2019 11:55 am
Forum: This is SolarChat !!
Topic: Proms and spot April 9, 2019
Replies: 12
Views: 433

Re: Proms and spot April 9, 2019

Very fine images, great resolution!
by LTHB
Wed Apr 10, 2019 11:53 am
Forum: This is SolarChat !!
Topic: AR12738 CaK April 07
Replies: 8
Views: 337

Re: AR12738 CaK April 07

Thanks, Christian, Bart, Stu and Maurits!

Yes, the picture is taken with the Mewlon and DS. The Mewlon should give better resolution when sky conditions are better - I hope to get some while AR127328 is still around...

Regards,

Frank
by LTHB
Mon Apr 08, 2019 6:40 pm
Forum: This is SolarChat !!
Topic: CaK April 1st
Replies: 3
Views: 193

Re: CaK April 1st

Thanks, Mark and Maurits!
by LTHB
Mon Apr 08, 2019 6:38 pm
Forum: This is SolarChat !!
Topic: AR12738 CaK April 07
Replies: 8
Views: 337

Re: AR12738 CaK April 07

Thanks, Mark and Paul!
by LTHB
Mon Apr 08, 2019 6:36 pm
Forum: This is SolarChat !!
Topic: CaK and H-alpha, 07042019, new AR
Replies: 13
Views: 422

Re: CaK and H-alpha, 07042019, new AR

Nice images! I prefer the new version of the h-alpha.

Regards,

Frank
by LTHB
Sun Apr 07, 2019 10:50 pm
Forum: This is SolarChat !!
Topic: AR12738 CaK April 07
Replies: 8
Views: 337

AR12738 CaK April 07

Seeing was good today, too good not to try imaging the new sunspot, but lots of haze in the sky, so no really sharp images. The best I could get from a bunch of videos:

Image

Regards,

Frank