Manufacturer: Baader
Product number: BA2458383

EUR 240,00


incl. 19 % VAT (DE)  
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Baader H-alpha CCD Narrowband Filter 7 nm
Narrowband H-alpha filters are very often used for astrophotography. They provide very good contrast when photographing diffuse nebulae which emit H-alpha light, like the North America Nebula. The Baader H-alpha filter blocks the entire visible light, except a small passage in the red H-alpha light. This offers some advantages:
The entire stray light of cities is hidden, so beautiful photographs are possible even close to a city.
Star images from refractor telescopes are significantly improved, the stars become sharper.
Combined with Baader O-III and S-II CCD narrowband filters, exciting false color images are possible.



Baader narrowband filters - application areas:

These filters have revolutionised astrophotography. It is possible to record very dim nebulae even for small telescopes. In this case only light of the nebula is transmitted and unwanted light is blocked. The gain in contrast is enormous.

Colour fringes from the telescope (chromatic aberration) are also reduced significantly or even eliminated completely. The stars are much smaller and seem almost like punched.

These properties are achieved by a complex filter design. Baader filters are manufactured according to professional standards and provide adequate performance.
Maximal contrast through steep edges.
Dual cavity design for focal ratio f/3 to f/10
Best sharpness through plane-parallel surfaces.
Resistant to aging through optimal sealing also at the edge.





Correct mounting of unmounted Baader filters

All unmounted Baader filters for which the direction of the filter is relevant have a small arrow placed at the edge. This arrow has to point to the telescope optics / sky. If there is no arrow, it does not matter how you mount the filter.



Filter type:Narrowband nebula filter
Transmission range:H-alpha around 656.3 nm
FWHM:7 nm
Filter thickness:3 mm
Diameter:50.4 mm unmounted
Coating:Dielectrically coated - plane-optically polished
Baader 7 nm H-alpha filter
High-quality system box - stackable

"My experiences with the 7nm Baader filter have been fantastic. The filter is of very high quality, as are all the Baader filters and accessories. The ST-8 came with the 3nm CS filter which I used for a few months with good results. I started using the 7nm Baader after a friend of mine recommended I give it a try. He has been using one with his ST-10. The coatings appear to be quite good. I´ve experienced minimal reflections on brighter stars. The price is also very reasonable."

Chris Cook


Fotografische Anwendung von Baader - Schmalband Filtern:

Bildautor: Johannes Schedler, © 2008 by Panther Observatory.

NGC7000+Pelican Mosaic with Baader NarrowbandCCD-filters. Note tight stars and absence of halos.




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