The Charlie Bates Solar Astronomy Project is proudly sponsored by the following fine companies:
ImageImageImageImage
Image
Image
Lou took this great image of a prom with his Lunt152 double stacked with a Quark

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

CaK Saturday 24th August

this is the main message area for anything solar :)
Post Reply
User avatar
Montana
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 20871
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK

CaK Saturday 24th August

Post by Montana » Sat Aug 24, 2019 5:14 pm

Well, lovely weekend so far. We saw this 2 weeks ago on the Jetstream forecast and they were right, the Jetstream has moved north and we have good weather :)

We had already booked tickets for the Churnet Valley Heritage Steam Railway for my birthday treat so as it was clear first thing I was out at the crack of dawn with the C11 (well I was ready for 9am when the Sun appeared in my garden).

I am not sure whether the seeing was good or bad as I have no reference but after 10 captures I only had one which was half decent. I had to stop the C11 down to 18cm as that seems the point where spherical aberration is removed and contrast appears and focus is possible. I also used the 2x Barlow as anything more was daft. I learned a lot.

I processed one with AstraImage and the same picture with ImPPG and they seem pretty similar to me.

ImageSun_075928_24_08_2019_AA1 f colour by Alexandra Hart, on Flickr

ImageSun_075928_24_08_2019_AA1 a by Alexandra Hart, on Flickr

ImageSun_075928_24_08_2019_imp f colour by Alexandra Hart, on Flickr

ImageSun_075928_24_08_2019_imp a by Alexandra Hart, on Flickr

First two are AstraImage, the second two are ImPPG. I am sure seeing wasn't as good as it could be but you never know until I have done at least 10 try outs.

C11 stopped to 18cm / Lunt CaK wedge / Aries ERF / 2x Barlow / ZWO ASI174

I then packed away and hurried off to catch the 11:02 train :)
DSC07216s.jpg
DSC07216s.jpg (2.33 MiB) Viewed 293 times
DSC07231s.jpg
DSC07231s.jpg (1.05 MiB) Viewed 293 times
Alexandra

User avatar
Carbon60
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 6257
Joined: Wed Mar 07, 2012 12:33 pm
Location: Lancashire, UK

Re: CaK Saturday 24th August

Post by Carbon60 » Sat Aug 24, 2019 6:16 pm

Happy Birthday, Alexandra. A lovely day out :)

I can’t see any difference between process methods either. Nice images.

Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/

User avatar
marktownley
Librarian
Librarian
Posts: 26266
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: CaK Saturday 24th August

Post by marktownley » Sun Aug 25, 2019 6:37 am

Both are great captures! Like Stu says there's no obvious difference between the 2 processing software, I guess stick with the easiest. What sort of exposure time were you using for the images above?

Happy birthday btw! Churnet Valley looks like fun.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

User avatar
MAURITS
Almost There...
Almost There...
Posts: 1020
Joined: Tue Nov 27, 2018 4:37 pm
Location: Belgium
Contact:

Re: CaK Saturday 24th August

Post by MAURITS » Sun Aug 25, 2019 7:29 am

Lovely pictures Alexandra.
Regards,
Maurits

Vista del Cielo Observatory

www.vistadelcielo.be

User avatar
Montana
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 20871
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK

Re: CaK Saturday 24th August

Post by Montana » Sun Aug 25, 2019 11:19 am

Thanks guys, been out again this morning trying to do a prominence animation.
Mark the exposure Shutter=5.789ms

Alexandra

User avatar
MapleRidge
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 5930
Joined: Fri Jan 13, 2012 11:58 pm
Location: Cambray, ON Canada

Re: CaK Saturday 24th August

Post by MapleRidge » Sun Aug 25, 2019 11:46 am

Hi Alexandra...

The CaK images look great and both processing methods look very similar to me. Well done :bow

Happy Birthday, and the hertiage train looks to be a wonderful way to spend it too!

Brian
Brian Colville

Maple Ridge Observatory

Cambray, ON Canada

allhoest
Im an EXPERT!
Im an EXPERT!
Posts: 269
Joined: Sun Mar 22, 2015 7:48 pm

Re: CaK Saturday 24th August

Post by allhoest » Mon Aug 26, 2019 7:44 am

Interesting results.
Your final focal ratio would then be around 30.
What was your exposure time?

CS
Alex

User avatar
yltansg
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1364
Joined: Sat Jun 14, 2014 9:33 am
Contact:

Re: CaK Saturday 24th August

Post by yltansg » Mon Aug 26, 2019 8:48 am

Hi Alexandra,

Wow!! Congrats!! Is this your first light with the Lunt CaK wedge?

I have all items (ARIES D-ERF, C11, Lunt CaK wedge, ASI174 camera) but I am not sure if I can get great CAK images like yours.

Alfred

User avatar
Montana
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 20871
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK

Re: CaK Saturday 24th August

Post by Montana » Mon Aug 26, 2019 8:41 pm

Thanks guys, yes this is my first light with the Aries ERF and the repaired Lunt CaK wedge. My first try out so I know I can do better :hamster: I look forward to some spots as trying to focus on a blank background is hard. I also need to get my head around a PST modification, no money for that yet though.

Alex my exposure with the ASI174 was 5.789ms

Alexandra

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3327
Joined: Sun Nov 18, 2012 3:13 pm

Re: CaK Saturday 24th August

Post by Valery » Tue Aug 27, 2019 12:10 am

Montana wrote:
Mon Aug 26, 2019 8:41 pm
Thanks guys, yes this is my first light with the Aries ERF and the repaired Lunt CaK wedge. My first try out so I know I can do better :hamster: I look forward to some spots as trying to focus on a blank background is hard. I also need to get my head around a PST modification, no money for that yet though.

Alex my exposure with the ASI174 was 5.789ms

Alexandra
Good enough starting result.

You should not go below 230mm aperture stop. Anything below this will cause contrast loss for details due to central obstruction too high influence.
With 230mm aperture your scope will work at 0,74 Strehl ratio at 393nm. With R-L deconvolution the images will be very close to what can be achieved with Strehl 1.0


Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3327
Joined: Sun Nov 18, 2012 3:13 pm

Re: CaK Saturday 24th August

Post by Valery » Tue Aug 27, 2019 12:13 am

yltansg wrote:
Mon Aug 26, 2019 8:48 am
Hi Alexandra,

Wow!! Congrats!! Is this your first light with the Lunt CaK wedge?

I have all items (ARIES D-ERF, C11, Lunt CaK wedge, ASI174 camera) but I am not sure if I can get great CAK images like yours.

Alfred
Do your imaging in the CaK in a proper time (early morning) with aperture stop 230-240mm and you will have all chances to get excellent images.

Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

Post Reply