I there was a specific solar filter foil, with slightly lower reflectivity than standard, we could routinely use much larger apertures for H-alpha at low cost.
Our common reflectors could be used without the astronomical cost of full aperture D-ERFs.
No need to strip our existing mirrors.
With most of the solar heat removed there would be much less thermal "stress" on the optical train.
The familiar PST mods and Quarks, we use now, would be protected from excessive heating from larger apertures.
There would be much lower thermal agitation in the optical path due to a lack of overheated, bare glass absorption.
So common Newtonians [and others of course] could be quickly convertible between The Dark and the Light Side.
There are very obvious dangers for the unwary in trying to view in white light without added and safe filtration.
They just need to use standard visual filter foil just as they do now.
Any constructive thoughts before I order a few hundred meters from Baader??
Common relectors for H-a?
- Rusted
- Way More Fun to Share It!!
- Posts: 1741
- Joined: Fri Jan 19, 2018 11:00 am
- Location: Central Denmark
- Has thanked: 8168 times
- Been thanked: 1943 times
- Contact:
Common relectors for H-a?
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
- marktownley
- Librarian
- Posts: 42545
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20813 times
- Been thanked: 10485 times
- Contact:
Re: Common relectors for H-a?
Sorry, it won't work. It will also cut transmission at the wavelength being observed. That's why erf's are needed for narrow band. Stripping the mirror only works for wide band observing in white light.
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!
- Rusted
- Way More Fun to Share It!!
- Posts: 1741
- Joined: Fri Jan 19, 2018 11:00 am
- Location: Central Denmark
- Has thanked: 8168 times
- Been thanked: 1943 times
- Contact:
Re: Common relectors for H-a?
Thanks. I'd better cancel that order. ;-)
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.