Baader Astro Solar - Filter foil for solar photography - 20x25cm

The photographical filter foil lets approx 1/1000 of the light pass through - 10x more than the visual foil. The photographical version has ND 3.8

It is intended for solar photography with long focal length where the visual foil is already too dark.

The photographical foil can also be used for visual purposes in combination with narrow-band contrast filters like the Baader Solar Continuum or the Baader K-Line filter. In this case, additional to a strong neutral or contrast filter, a UV cut filter is necessary - see "accessories".

The Baader Astro Solar Foil has been awarded as the astro product of the decade in the USA.

The following characteristics have made this possible:

-- Optimal protection: The foil is covered on both sides with a filter layer, not only on one side. Every layer can contain micro-holes that bypass UV rays. With a layer on both sides, this is not possible any more.

-- Exceptional optical quality: The Astro Solar foil as an optical performance that is superior to e.g. Mylar foils. This is proven by an independent test. Compared with glass filters, the Baader foil is superior, too - in every section, it has a diffraction-limited performance. What is more, the foils is colour neutral. It does not give a green or yellow colour.

-- Very rigid: A glass filter may break and a foil may rip. But the Baader Astro Solar Foil is, becaus of its special molecular structure, extremely rigid.

Such spectactular pictures are possible with the Baader Solar filter foil.

Andreas Murner has captured this group with the Baader Foil (photographical version) and a Baader Solar Continuum filter. Instrument: TS 127/1200mm achromatic refractor.

Such high-resolution pictures are only possible with a good objective and a good solar filter. There are many pictures like this that have been made with the Baader Astro Solar foil.

The colour of the sun through the foil

The sun is depicted in a neutral cool white tone. It is a tale that the sun would appear in blue. The neutral tone allows views full of contrast and is described by many observers as "very pleasant". Especially at higher magnifications, this allows successful observations.
 
Some astronomers prefer a warm orange or yellow colur. This colour does not represent the reality and is - from our point of view - not optimal for maximum contrast and finest details, but in combination with this neutral-colour foil, one can experiment with differnt colour filters and can choose the best. Thus you are not fixed to one colour.

Technical details:

-- Solar filter foil - double side coating - DIN A 4 format (ca. 20x30cm)
-- Light transmission approx. 1/1000 of the original value - the rest is reflected