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

Search found 3331 matches

by Merlin66
Sat Oct 12, 2019 5:35 am
Forum: Solar Scope Modifications
Topic: DIY Solar Wedge ND3.0 alternatives for Imaging only
Replies: 15
Views: 489

Re: DIY Solar Wedge ND3.0 alternatives for Imaging only

Having used the Baader film on scopes up to 100mm I always though it was pretty good.....
Now using the Baader wedge I feel the difference is noticeable. Obviously needs those moments of steady seeing which are far between.
Good processing techniques (which I don't have!) can make the difference.
Ken
by Merlin66
Fri Oct 11, 2019 8:41 am
Forum: Solar Scope Modifications
Topic: DIY Solar Wedge ND3.0 alternatives for Imaging only
Replies: 15
Views: 489

Re: DIY Solar Wedge ND3.0 alternatives for Imaging only

Martin,
I still have the ND1.8 and the Continuum filter from my early Herschel Wedge trials.
I use the USB3 cameras to gain even faster frame rates....and SSD drives.
Well worth considering.
by Merlin66
Fri Oct 11, 2019 6:53 am
Forum: Solar Scope Modifications
Topic: DIY Solar Wedge ND3.0 alternatives for Imaging only
Replies: 15
Views: 489

Re: DIY Solar Wedge ND3.0 alternatives for Imaging only

Martin,
Well done mate! Looking good.
You may be interested in that ND1.8 filter......
by Merlin66
Mon Oct 07, 2019 9:01 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 28
Views: 541

Re: PST modification - idiots guide

My previous message seems to have got lost in space.... You don't need a 2" focuser.... I went for the Borg 1.25" Helical focuser and use it on all the Spectra-L200 spectrographs as well as the SHG. The focus on the donor scope should be fixed, and any re-focus requirements due to cameras, eyepieces...
by Merlin66
Mon Oct 07, 2019 6:51 am
Forum: Solar Scope Modifications
Topic: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 62
Views: 1116

Re: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)

Yes,
I saw that .....
As we keep saying solar mods are non standard and should be treated with extreme caution.
We are stretching the envelope.....always opt for the safest option.
I personally think all ERF and sub ERF for H alpha should be Baader D-ERF filters.
by Merlin66
Sun Oct 06, 2019 12:17 am
Forum: This is SolarChat !!
Topic: 3rd Oct 2019 Solar activity
Replies: 12
Views: 177

Re: 3rd Oct 2019 Solar activity

Alfred,
We were clouded out on the 4th, got a couple of images through high cloud on the 5th, and today started overcast but high winds cleared the cloud but stopped play!!!!
by Merlin66
Sat Oct 05, 2019 11:23 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20191005) | FD images
Replies: 9
Views: 176

Re: Today's SUN (20191005) | FD images

Well done mate!
Good collection of quality images.
by Merlin66
Sat Oct 05, 2019 6:58 am
Forum: This is SolarChat !!
Topic: AR 2749 2nd Oct 2019
Replies: 10
Views: 124

Re: AR 2749 2nd Oct 2019

Thanks everyone!
I only wish the seeing down here, and my processing skills was better!
by Merlin66
Sat Oct 05, 2019 2:10 am
Forum: Forum Support Issues
Topic: Spam messages
Replies: 0
Views: 96

Spam messages

Some of you may have seen some obvious spam messages appearing over the past few days.
Rest assured the Mods are trying to contain this type of rubbish.
Bear with us.
by Merlin66
Fri Oct 04, 2019 5:17 am
Forum: This is SolarChat !!
Topic: 3rd Oct 2019 Solar activity
Replies: 12
Views: 177

Re: 3rd Oct 2019 Solar activity

Thanks everyone, appreciated! The poor seeing at the coast and my lack of processing skills limits the detail.... I also notice that the CaK image shows much better detail towards the top of the image and appears "off-band" at the bottom. I can only assume misalignment of the internal filters??? Any...
by Merlin66
Thu Oct 03, 2019 9:06 am
Forum: This is SolarChat !!
Topic: 3rd Oct 2019 Solar activity
Replies: 12
Views: 177

Re: 3rd Oct 2019 Solar activity

Alexandra,
I have a SM60 DS on an ED80 and a CaK filter stack on an ED80 stopped down to f10.
Unfortunately the seeing down here at the coast is pretty average.
by Merlin66
Thu Oct 03, 2019 4:23 am
Forum: This is SolarChat !!
Topic: 3rd Oct 2019 Solar activity
Replies: 12
Views: 177

3rd Oct 2019 Solar activity

AR 2749 and friend, some Proms and a couple of filaments.
Enjoy.
Sun_095958.jpg
Sun_095958.jpg (190.13 KiB) Viewed 177 times
Sun_100552.jpg
Sun_100552.jpg (191.93 KiB) Viewed 177 times
Sun_101357.jpg
Sun_101357.jpg (151.04 KiB) Viewed 177 times
Sun_101055.jpg
Sun_101055.jpg (169.66 KiB) Viewed 177 times
Sun_095139.jpg
Sun_095139.jpg (39.97 KiB) Viewed 177 times
Sun_094852.jpg
Sun_094852.jpg (49.28 KiB) Viewed 177 times
Sun_095620.jpg
Sun_095620.jpg (27.24 KiB) Viewed 177 times
by Merlin66
Thu Oct 03, 2019 1:09 am
Forum: This is SolarChat !!
Topic: AR 2749 2nd Oct 2019
Replies: 10
Views: 124

AR 2749 2nd Oct 2019

Some images in poor seeing.....
CaK/ ED80 (2f10), SM60 DS/ ED80 with Baader x2.25 Barlow and ASI 1600.

There's another AR which has swung into view behind AR 2749........
105237.jpg
105237.jpg (15.56 KiB) Viewed 124 times
104959.jpg
104959.jpg (31.64 KiB) Viewed 124 times
103207.jpg
103207.jpg (9.24 KiB) Viewed 124 times
101343.jpg
101343.jpg (11.65 KiB) Viewed 124 times
100838.jpg
100838.jpg (65.06 KiB) Viewed 124 times
Sun_103454.jpg
Sun_103454.jpg (68.82 KiB) Viewed 124 times
Sun_095731.jpg
Sun_095731.jpg (261.5 KiB) Viewed 124 times
by Merlin66
Wed Oct 02, 2019 1:22 am
Forum: Solar Scope Modifications
Topic: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)
Replies: 62
Views: 1116

Re: Easy PST Module with ERF (non-destructive, no cutting of OTA, & no-black-box rebuild)

I tested the Coronado BF15 mirror with the spectrograph some time ago and found as you say it's a IR reject mirror.
by Merlin66
Sun Sep 29, 2019 4:59 am
Forum: This is SolarChat !!
Topic: Prominences & Disc | HA | Sept 28th 2019
Replies: 14
Views: 203

Re: Prominences & Disc | HA | Sept 28th 2019

Marty,
You don't specify....but I assume your Quark filter was used?
by Merlin66
Thu Sep 26, 2019 2:05 am
Forum: This is SolarChat !!
Topic: ASI174 solar flat problem with PST
Replies: 10
Views: 233

Re: ASI174 solar flat problem with PST

Jordan,
I assume you’re talking about the rich view tuning on the external etalon?
Or the retuning of the PST etalon?
This has no real impact on the sweet spot. The tilt of the DS and the tilt of the internal PST is the issue.
The sweet spot can appear as a brighter area within the image.
by Merlin66
Wed Sep 25, 2019 11:51 pm
Forum: Solar Scope Modifications
Topic: New CaK filter assembly.
Replies: 5
Views: 182

Re: New CaK filter assembly.

Alex,
To be honest the average seeing down here at the coast is pretty poor.
I struggle to use beyond f20 with the Ha, ED80 with x2.5 PM.
I will try the same set up with the CaK.
by Merlin66
Wed Sep 25, 2019 12:19 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 28
Views: 541

Re: PST modification - idiots guide

Alexandra, The 200mm is a fixed physical distance due to the rear lens in the etalon assembly. If you use the scope focuser you’re effectively changing the -200mm spacing required for the front lens of the assembly. In effect the position of the scope focus is moved relative to the front lens. The h...
by Merlin66
Wed Sep 25, 2019 7:41 am
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 28
Views: 541

Re: PST modification - idiots guide

Which ERF did you use?
by Merlin66
Wed Sep 25, 2019 6:23 am
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 28
Views: 541

Re: PST modification - idiots guide

George, Your point is well made! The suggested Baader 35nm is exactly the same spec as the Baader D-ERF. Belt and braces?? Alexandra, I find the focuser almost mandatory. Once the etalon is positioned at the majic -200 mm you don’t want to move it. A helical focuser is a simple idea to allow you to ...
by Merlin66
Tue Sep 24, 2019 7:11 am
Forum: This is SolarChat !!
Topic: Calculating Earth Scale
Replies: 6
Views: 154

Re: Calculating Earth Scale

Will do!
Ken
by Merlin66
Sun Sep 22, 2019 9:19 pm
Forum: This is SolarChat !!
Topic: Calculating Earth Scale
Replies: 6
Views: 154

Re: Calculating Earth Scale

The size of the Earth is 1/108.7 the size of the solar disk.
If the Sun's disk measures 2380 pixel, then the Earth disk would be 2380/108.7 = 23.5 pixel
Corono software can help.
http://sweiller.free.fr/Softwares/Corono/corono.html
by Merlin66
Wed Sep 18, 2019 8:56 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: PST etalon repair, decontacted?
Replies: 14
Views: 235

Re: PST etalon repair, decontacted?

Marty,
I don't see the four small spacer flakes???
Are these visible?
by Merlin66
Wed Sep 18, 2019 6:45 am
Forum: Solar Scope Modifications
Topic: New CaK filter assembly.
Replies: 5
Views: 182

Re: New CaK filter assembly.

Some interesting reading on CaK observations (Zirin)
http://adsabs.harvard.edu/full/1974SoPh...38...91Z
by Merlin66
Wed Sep 18, 2019 4:27 am
Forum: Solar Scope Modifications
Topic: New CaK filter assembly.
Replies: 5
Views: 182

New CaK filter assembly.

Just completing a new CaK 2A filter assembly..... This version is based on a 2" Baader Blue CCD filter as an "ERF" give a good UV cut below CaK (393nm) and above about 520nm. Then follows a #1 "Yellow" filter removed from a CaK PST. This has a bandwidth of 2A centred on CaK. The third element is an ...