Manufacturer: Baader
Product number: Sofi50v

EUR 69,00


incl. 19 % VAT (DE)  
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excl. 6.95 € shipping costs (DE)  
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Product expected to be available from 12.04.2024

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rating: 5.0 of 5
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A good base for self-built solar filters:

With the Baader Astro Solar film, you can watch and capture the sun with full contrast. It offers also better protection against UV rays than simple glass filters.


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



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.


An example for photographic use:



This group was captured 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.
Transmission:approx. 1/100,000
Substrate:special film, developed for scientific use
Coating:aluminium
Optical quality:diffraction limited
Safety:proven by the PTB, Braunschweig, Germany
Size:50 cm x 49 cm sheet
1 sheet (50 cm x 49 cm) AstroSolar, visual type, in rigid cardboard roll

Images from a comparative test

Interferometrical Test


Reference
Ideal picture - Strehl 1.01
(only theoretical)




Baader AstroSolar
close to the optimum -
like a good objective




Mylar Solar foil
irregularities are obvious. This would be
neither a good filter nor a good objective



Star test


Reference
Airy disc - 99.9% Strehl
(only theoretical)




Baader AstroSolar
94,1% inside the Airy disc
Comparable with a very good objective




simple mylar solar filter
57,2% inside the Airy disc
not diffraction limited any more




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Reviews

Written by Wilfried Brokmeier
on 2022-09-09

"Wechsel die alte Baaderfolie in den vorhandenen Rahmen aus!"

Written by Evgeniy Bogatyrev
on 2021-03-25

*****

Written by Klaus-Peter Janovics
on 2020-06-24

"Wird von mir visuell und fotografisch verwendet an einem 6-zölligen Achromaten. Die Folie erscheint mir beugungsbegrenzt und ist von der Mindest- bis hin zur förderlichen Vergrößerung in angenehmer Helligkeit verwendbar. Sie ist für Anfänger und fortgeschrittene Beobachter gleichermaßen bestens geeignet! Von mir eine klare Empfehlung!"

Written by Theis Thomas
on 2020-06-21

"Die Lampe ist genau so wie in der Artikelbeschreibung. ich bin zufrieden. Schnelle und sichere Lieferung."

Written by Sebastian Georgi
on 2020-04-19

Einwandfrei

Written by Christian Priller
on 2019-12-17

"Die Größe der Folie ist super. Man kann die Folie individuell anwenden (bei mir Teleskop, Sucher und DSLM Kamera) und je nach verwendung hat man dann immer noch einen Rest übrig. Zur Folie: wurde bereits getestet und sie ist sehr angenehm. Die Sonne leuchtet in einem schönen hellen weiß. Sonnenflecken waren seither leider noch nicht vorhanden, deshalb kann ich nichts zum Kontrast und zu deren Abbildung sagen. Da aber auch so der Kontrast sehr gut ist, denke ich dass die Flecken gut abbgebildet werden. Ich kann dieses Produkt jedem empfehlen, der sich auch unseren Heimatstern genauer ansehen möchte. "

Written by Gordon Kleyer
on 2017-08-01

"Die Folie macht was sie soll, macht einen stabilen Eindruck. Die Anfertigung eines Filters war problemlos."

Written by Philip Ransley
on 2017-05-30

"Well packaged"

Written by Ton Sijm
on 2016-07-31

"I´ve mae 2 solarfilters out of it, they look and work as expected."

Written by Jean-Pierre Faugeron
on 2016-07-30

"trés bien"

Written by Nikolaus Hanjohr-Popa
on 2016-05-23

Spitze

Written by Martin Müller
on 2016-05-23

"Macht was sie soll."

Written by Edmund Serpell
on 2016-05-04

"as expected"

Written by Yuriy Didenko
on 2016-04-02

"Yet I am looking at the sun, but I think the quality of the film on top."

Written by Franz Hoja
on 2016-03-15

"Alles sehr gut"