Hi
I now can use some bits for a 12" dobsonian.
I lent the mirror to someone and they cleaned it without asking and took half the aluminium off!
'Home' aluminised at my first club and some pre-cleaning artefact in the coating it looked like.
So might as well take it all off.
Whats the best narrow band filter (s) to use?
Rod points out he used a 10" Newtonian for solar projection for hours with no issues.
Andrew
12" White light Newtonian
-
- Way More Fun to Share It!!
- Posts: 1444
- Joined: Fri Mar 30, 2018 6:46 am
- Location: Derbyshire UK
- Has thanked: 3295 times
- Been thanked: 1887 times
- MalVeauX
- Way More Fun to Share It!!
- Posts: 1858
- Joined: Tue May 09, 2017 7:58 pm
- Location: Florida
- Has thanked: 1171 times
- Been thanked: 1360 times
Re: 12" White light Newtonian
Heya,
Well, use a 656nm (Astronomik HA 12nm) filter for poor seeing.
Use a 395nm or 430nm (Andover or Edmund Optics) for higher angular resolution with very good seeing.
Very best,
Well, use a 656nm (Astronomik HA 12nm) filter for poor seeing.
Use a 395nm or 430nm (Andover or Edmund Optics) for higher angular resolution with very good seeing.
Very best,
-
- Way More Fun to Share It!!
- Posts: 1444
- Joined: Fri Mar 30, 2018 6:46 am
- Location: Derbyshire UK
- Has thanked: 3295 times
- Been thanked: 1887 times
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10248 times
- Contact:
Re: 12" White light Newtonian
Depends how much light you want coming through
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!
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: 12" White light Newtonian
Yep, you are absolutely right!
-
- Almost There...
- Posts: 521
- Joined: Sun Mar 22, 2015 7:48 pm
- Has thanked: 714 times
- Been thanked: 496 times
Re: 12" White light Newtonian
"Don't forget to de-aluminise the secondary mirror!"
If you do so, you will have a very strong filtering.
Maybe you want it that way, but keep in mind that you will have to collimate it!
If you do so, you will have a very strong filtering.
Maybe you want it that way, but keep in mind that you will have to collimate it!
-
- Way More Fun to Share It!!
- Posts: 2150
- Joined: Sun Jun 14, 2015 4:46 pm
- Location: France
- Has thanked: 1 time
- Been thanked: 2714 times
- Contact:
Re: 12" White light Newtonian
As said by Alexandre, just keep the primary uncoated and the secondary coated.
Regarding filters, it all depends on the seeing conditions at your place. A 300 mm is a bit of a large telescope for solar image.
The range of usual filters are :
- deep-sky Ha, when seeing is bad,
- 540 nm, when seeing is good,
- deep-sky OIII, when seeing is pretty good,
- 430 nm, when seeing is excellent,
- 396 nm, when seeing is perfect.
Regarding filters, it all depends on the seeing conditions at your place. A 300 mm is a bit of a large telescope for solar image.
The range of usual filters are :
- deep-sky Ha, when seeing is bad,
- 540 nm, when seeing is good,
- deep-sky OIII, when seeing is pretty good,
- 430 nm, when seeing is excellent,
- 396 nm, when seeing is perfect.
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/