Sun filter

[ElPelado]

I want to buy a Mylar film to make a sun filter. I asked in an astronomy store and they said that they have black polymer, and thats this is better than Mylar.... can anyone tell me what it is?

[Adirondack]

ElPelado,

may you should ask for "Baader Astro Solar™ Safety Film".

More informations (in English):
http://www.baader-planetarium.com/sofifolie/details_e.htm

I think, it is the best and healthy you can get...

Adirondack

[ElPelado]

I know mylar is good and is cheap, but i want to know what black polymer is...

[Adirondack]

ElPelado,

"Baader Astro Solar™ Safety Film" is not a mylar film nor a black polymer!
It's something else but much better for visual and photographical use!

Quality sequence: Mylar -> Black polymer -> Baader Astro Solar Film

To answer your question:
Black Polymer: A lower cost alternative where only low magnification is used such as with binoculars, threaded camera filters and finder scopes. Stronger than Mylar with the filtering properties protected within the substrate.

[ElPelado]

It cant be used with a 3" telescopes using 35x or 56x??

[Adirondack]

Any of the films can be used for your 3" telescope!
But the Baader film privides a better result.
No false colours, better contrast and so on.
That's all.

[ElPelado]

And its more expensive.... right?

[Adirondack]

It's about 20 EUR / US$.

What do you want?
A golden ring for 1 buck?

Or want to go blind and spare 20 Euros?

[ElPelado]

Ok, I'll see what I can do...
And I think I will try to buy the black polymer or the baader...
Thanks

[Adirondack]

ElPelado,

where do you come from? Spain?
Maybe we can meet each other on October, 3rd 2005 near
Alicante to watch the solar eclipse...

... and you can have a look through my telescope with the Baader film.

Or are you still in Argentina?

[ElPelado]

Not argentina nither Spain, and i want the filter for the transit...