New: Baader O-III CCD Narrowband Filter 8.5 nm - 50x50 mm w/o cell
Narrowband O-III nebula filter with 8.5 nm band width for astrophotography.
The filter is new, only a handwritten note "BAO3" can be seen on the packaging. O-III CCD narrow band filter for extremly contrasty images FWHM 8.5 nm for contrasty astro images, even from locations close to towns Unmounted filter for inserting into filter drawers or filter wheels Ideal for combining with H-alpha and S-II filters for false color images The 8.5 nm O-III is meant for photographic use Comes in high-quality stackable plastic system box Reflection free coated and plane-optically polished Each filter is individually hard coated for optimal sealing even at the edge. Baader filter do not age.
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Baader O-III CCD Narrowband Filter 8.5 nm
Narrowband O-III filters are very often used for astrophotography. They provide very good contrast when photographing diffuse nebulae which emit [O III] light, like the Cirrus Nebula. The Baader O-III filter blocks the entire visible light, except a small passage in the blue-green [O III] 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 H-alpha 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 anf 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: | O-III around 501 nm |
FWHM: | 8.5 nm |
Filter thickness: | 3 mm |
Size: | 50 mm x 50 mm unmounted |
Coating: | Dielectrically coated - plane-optically polished |
System speed: | up to f/2.8 |
Baader 8.5 nm O-III filter High-quality system box - stackable
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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