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 Omega 2A CaK filter (as a double stack)
The initial results look promising...
bright speckles showing!
I need to consider whether or not at add a tilter to each or either of the 2A filters to fine tune the CWL.
Used with a stopped down ED80 (60mm f10) and ASI 1600MM.
Firecapture, AS3!, ImPPG, Corono
Onwards and Upwards.
New CaK filter assembly.
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
New CaK filter assembly.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- marktownley
- Librarian
- Posts: 42270
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20424 times
- Been thanked: 10243 times
- Contact:
Re: New CaK filter assembly.
Excellent Ken! I use my ED80 stopped down to 60mm regularly for CaK (full disks) and with a 3X barlow for closeups. Maybe use a barlow nosepiece to fill the chip more? Definitely give the DS version a go, looking for the spicule ring is a key that it is working.
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!
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: New CaK filter assembly.
Some interesting reading on CaK observations (Zirin)
http://adsabs.harvard.edu/full/1974SoPh...38...91Z
http://adsabs.harvard.edu/full/1974SoPh...38...91Z
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
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.
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.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer