Manufacturer: Baader
Product number: BA2961580

EUR 118,00


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rating: 5.0 of 5
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Baader 7.5 nm Solar Continuum Filter (540 nm) in 1.25" Cell
for Visual and Photographic Observations of the Sun

The Solar Continuum Filter is practically a narrow band photosphere filter for solar observation in white light. It provides the highest contrast in the photosphere of the sun. The filter works as a monochromator: suppressing the effects of the atmospheric turbulence and delivering images that are significantly sharper.

Lens systems - including those of apochromats, catadiopters or eyepieces - are traditionally optimized for the spectral range around 540 nm, since this is where our eye has the highest sensitivity. This narrowband filter therefore blocks everthing with the exception of the spectral range in which a lens optic works most sharply and with the highest contrast. The effect is greatest on achromatic lens telescopes; but there is also an effect on apochromatic telescopes, catadioptric systems, and even pure mirror systems by reducing air turbulence.

As a monochromatic filter, it is ideal for use on monochromatic cameras and can even provide a tremendous gain on pure color systems.

With a colour camera, as with deep-sky narrow-band photography, it is less effective as only the green pixels are used. Thus, although you still benefit from the improved image sharpness of the telescope that is optimised for green wavelengths (and the reduction of the influences of air turbulence), with a colour camera you cannot fully exploit the better image quality compared to monochrome cameras, as you are effectively working with reduced camera resolution.

Compared to the previous model with 10 nm half-band-width, this filter has a half-band-width of only 7.5 nm, which increases the contrast even more. It thus replaces both the previous Baader 10 nm Solar Continuum filter and the stacked 1.25" Filter BA2458392. The single filter is so good that stacking is no longer necessary - the contrast gain of a single 7.5 nm filter makes stacking unnecessary, and this performance is now also available in 2".

The Baader 7.5 nm Solar Continuum filter is also be included in the scope of delivery of the Cool Ceramic Herschel prism Mark II, which is in preparation.

The Baader 7.5 nm Solar Continuum also offers all the advantages of the CMOS-optimized Baader filters:
Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
Reflex-Blocker coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
Identical filter thickness to existing standards, with utmost care for parfocality
Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)
Life-Coat: evermore hard coatings to enable a non-aging coating for life - even in a most adverse environment

Type of Filter:Narrowband
Filter Usage:CMOS, visually, contrast enhancement, solar
CWL (Central Wavelength):540 nm
Transmission Range:535 - 545 nm
FWHM (full width at half maximum:7.5 nm
Filter Thickness (without cell):2 mm
AR-Coating:Reflex-Blocker hard coated, planeoptically polished
Filter shape:round
Filter size:1.25"
Filter mount:mounted (LPFC 6 mm)
Net weight:0.006 kg
Filter
Protective box



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Reviews

Written by Angele TISSOT
on 2024-01-06

"A bit susîcious, but it works, sun surface is a bit sharper by using this filter."

Written by Ruediger Wemhoener
on 2023-07-15

"Hilfreich bei der Sonnenfotografie."

Written by Jürgen Kahrs
on 2023-01-24

"Ich nutze den Filter nicht zur Sonnenbeobachtung sondern mit einer digitalen Kamera. Der Durchlassbereich des Filters ist sehr schmal, trotzdem reicht das Licht, um normal ausgeleuchtete Alltagsszene zu sehen, das hatte ich nicht erwartet."

Written by Dupre Franck
on 2021-06-29

"LE filtre indispensable la photographie du soleil."

Written by Michael Danielides
on 2021-06-02

"Ich finde das Produkt hilfreich und verwende es an Optiken die größer als 4 Zoll (ca. 10 cm) sind. Dabei muss man sagen, dass beim Sonne beobachten in Kombination mit einem Sonnenfilter der Kontrastfilter wirklich ganz hervorragend, z.B. die Penumbra-Regionen hervorhebt."

Written by Steffen Wetzel
on 2021-04-15

"Ich habe den Filter an einem Herschelprisma an einem 150er Apo bei starkem Seeing getestet. Der Kontrast ist nachweislich besser. Eventuell leistet ein DeepSky-Linienfilter (H-Beta oder OIII) gleiche Dienste, wenn man diesen eh schon hat. Das konnte ich bisher noch nicht testen. (Herschelprisma bzw. Objetivsonnenfilter nicht vergessen!)"

Written by Michael Reuter
on 2019-11-28

"Der Filter hebt wunderbar die Strukturen in der Photosphäre hervor. Perfekt für Refraktoren mit Farbfehler, da hier nur ein schmaler Spektralbereich genutzt wird in dem diese Geräte am besten korrigiert sind."

Written by Oliver Rieck
on 2018-02-22

"In Verbindung mit einem Herschelkeil und ND3 Filter sehr hoher Kontrast. Gerade die Fackelgebiete am Sonnenrand sind schön zu erkennen. Auch die Sonnenflecke und die Granulation lassen sich kontrastreich Beobachten. Die Sonne erscheint mit dem Filter grün !"

Written by Yue Chui
on 2016-02-24

"This is a specialised filter for white light solar photography and visual observation - provided you have an appropriate solar filter at the front before solar radiation enters the telescope, or some other forms of energy rejection mechanism. It is extremely important for imaging to have a UV and IR cut filter such as a luminance filter added to the imaging train however, otherwise massive contrast degradation can be expected. I have the single solar continuum filter version, but if I am to choose again I would have chosen the stacked version. In any case, contrast improvement is ""shocking"". For imagers, the ND3.8 solar film is vastly preferred because it allows lucky imaging and then selecting images where the atmosphere is more stable. As I use the UV and IR cut filter for visual orientation in the flip mirror, I control the UV and IR leakage by stacking with the Astrodon Sloan G photometric filter (400-550 nm). In any case, this filter allows a tremendous amount of detail to be revealed on the photosphere. I especially use it to study evolution of granules along with corresponding supergranules and the chromospheric network using the Baader 1.25 inch Calcium K filter, which allows details in the chromosphere to be seen."