Baader 7.5nm Solar Continuum Filter (540nm)

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Baader 7.5nm Solar Continuum Filter (540nm)

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€ 118.00 Price excl. German VAT tax (19%): € 99.16

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  • Baader 7.5 nm Solar Continuum Filter, CWL 540nm
  • A must for owners of achromatic refractors. This narrowband-filter cuts the spectral range where lens optics draw sharpest and contrastiest. The Baader Solar Continuum Filter brings power back to you.
  • Enhances contrast and reduces the effect of atmospheric turbulence (in combination with white light solar filters)
  • Enormous contrast gain in monochrome photography even on pure color systems
  • Important note: The Solar Continuum Filter must be used for purely VISUAL solar observation ONLY with additional filtering (e.g. Baader Herschel prism or AstroSolar Safety Filml)

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€ 118.00 Price excl. German VAT tax (19%): € 99.16

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What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

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What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

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Baader 7,5nm Solar Continuum Filter – 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, catadiometers or eyepieces - are traditionally optimized for the range around 540nm, since this is where our eye has the highest sensitivity. This narrowband filter therefore cuts out 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.

Zeiss AS 150/2250 with Herschel Wedge, ND3 and ND0,9
Zeiss AS 150/2250 with Herschel Wedge, ND3 and Baader 7,5 nm Solar Continuum

With a colour camera, as with deep-sky narrow-band photography, 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), you cannot fully exploit the better image with a colour camera compared to monochrome cameras, as you are effectively working with reduced camera resolution.

Compared to the previous model with a 10nm half-band-width, this filter has a half-band-width of only 7.5nm, which increases the contrast even more. It thus replaces both the previous Baader 10nm Solar Continuum filter and the stacked 1 1/4" filter #2458392. The single filter is so good that stacking is no longer necessary - the contrast gain of a single 7.5nm filter makes stacking unnecessary, and this performance is now also available in 2".

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

Test report:

Baader Blogpost:
Test Report: Baader Solar Continuum Filter revisited – now with 7,5nm FWHM

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, read more)
  • Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

Baader Blogpost:
New CMOS-optimized Baader Filters

Important information for Solar Observing

For purely VISUAL observation, the Solar Continuum filter must ONLY be used in combination with our Herschel wedge with an additional ND3 filter or alternatively with the AstroSolar Safety Film (ND 5.0). The Solar Continuum must always be installed behind the actual solar filter.

The combination of AstroSolar photographic film (ND 3.8) and Solar Continuum filter or the photographic ND filters of the Herschel wedge must only be used for photographing the sun at the highest magnifications. These weakers must only be used to achieve very short exposure times with a camera, and thus to minimise the influence of air turbulence. AstroSolar photo film (ND 3.8) is also not suitable for mounting directly in front of a camera lens. The resulting image brightness is much too high.

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