Uv/ir cut

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
Post Reply
alessbonsai
Im an EXPERT!
Im an EXPERT!
Posts: 214
Joined: Tue Apr 14, 2020 8:06 am
Has thanked: 513 times
Been thanked: 642 times

Uv/ir cut

Post by alessbonsai »

in WL with astrosolar, in front of the 540nm filter do I have to use a uv/ir filter? is the Baader filter suitable or do I have to use one in particular


PST coronado Mod
Planet 102 f11
Vixen 70/900 mod WL
Dennis
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1858
Joined: Sat Apr 27, 2019 6:44 pm
Location: Germany
Has thanked: 3296 times
Been thanked: 2401 times

Re: Uv/ir cut

Post by Dennis »

It might give better results. Baader recommends a uv/ir cut filter for visual use with the 540nm filter and the shown bandpass ranges from 400nm-700nm. So i would try it out and see if a difference is there.


Triband C9.25

H-a: 2x Lunt40 rear mounted

WL: Antlia 500nm/ 3nm, 393 nm/ 3nm

Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo), corrective lenses (thanks again Apollo)

Cameras: imx432 + imx462
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
User avatar
Montana
Librarian
Librarian
Posts: 34958
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 18587 times
Been thanked: 9104 times

Re: Uv/ir cut

Post by Montana »

I usually do, the older versions of the Baader Continuum didn't block very far IR so tended to make imaging blurry. If you have one, use it anyway, it won't change anything if you don't need it but will make a huge improvement if you do need it :)

Alexandra


alessbonsai
Im an EXPERT!
Im an EXPERT!
Posts: 214
Joined: Tue Apr 14, 2020 8:06 am
Has thanked: 513 times
Been thanked: 642 times

Re: Uv/ir cut

Post by alessbonsai »

i have the new version of the uv/ircut filter. I can mount the 1.25 filter directly on the nose of the camera … camera-filter540-barlowtv2x-uv/ir-herschel filter…


PST coronado Mod
Planet 102 f11
Vixen 70/900 mod WL
User avatar
marktownley
Librarian
Librarian
Posts: 43156
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 21685 times
Been thanked: 11036 times
Contact:

Re: Uv/ir cut

Post by marktownley »

I would mount that uv/ir cut much higher up the optical train if you can


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!
alessbonsai
Im an EXPERT!
Im an EXPERT!
Posts: 214
Joined: Tue Apr 14, 2020 8:06 am
Has thanked: 513 times
Been thanked: 642 times

Re: Uv/ir cut

Post by alessbonsai »

I always get confused… at the top you mean near the sensor or the telescope? My doubt is, can a filter immediately after the sensor worsen the performance of the powermate or telecentric in general?


PST coronado Mod
Planet 102 f11
Vixen 70/900 mod WL
DavidP
Almost There...
Almost There...
Posts: 503
Joined: Sun Mar 08, 2020 9:25 pm
Location: Austin Texas
Has thanked: 167 times
Been thanked: 362 times

Re: Uv/ir cut

Post by DavidP »

Generally, when we talk about before or after in an optical train we are referencing the path of light in time. So with a refractor, first is the objective lens, last is the detector.
It seems to be good practice to put the UV/IR filter closer to the refractor objective. The earlier you can reject heat causing energy, the better. This lessons the potential to build up heat in the system. When Mark says higher up, he means earlier in the incoming light path or closer to the refractor objective.


Post Reply