Enhance your astrophotography with the Astronomik OIII 6nm Narrowband Filter. Designed to isolate the OIII spectral line at a precise 6nm bandwidth, this filter effectively captures elusive nebulae details while minimizing light pollution and atmospheric interference. Elevate your imaging of emission nebulae and reveal the intricate structures of the cosmos. Compatible with various telescope setups, the Astronomik OIII 6nm Narrowband Filter is your gateway to breathtaking celestial photography.

All Astronomik Filters are perfect for modern cameras, including both CMOS and CCD based cameras, allowing you to capture the very best images possible with your instruments. Sharpness, contrast and the absence of any reflections is guaranteed.

Each and every Astronomik filter has to pass a complex quality control process before being suitable for delivery to our customers. Each and every emission line filter is measured with a high-end Perkin-Elmer spectral-photometer to make sure that every single filter is up to the specifications published on our website.

On the back of each filter-box you will find a label that details the precise sensitivity and band pass measurements for that individual filter inside the box: You will see the max transmission and the recommended range of focal ratio were the filter will give you the best performance.

The OIII-CCD Filter is suitable for imaging of OIII nebulas from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 501nm and the background is increased enormous!

Due to the combination of the narrow bandwidth of 6nm and the high transmission of close to 100%, the filter gives you an enormous contrast boost, as all unwanted light from other wavelengths than <xx> is blocked form UV up to the IR. This results in an extremely dark background.
The FWHM of 6nm is matched to give you optimal performance with CCD and CMOS sensors with a very low dark current! The 6nm filter is the best choice if you are observing from a heavily light polluted site or if you are imaging faint objects in star crowded regions of the Milky Way.

Due to the new MFR coating technique you may use one single filter on all instruments up to f/4 without a significant reduction in performance.

The Astronomik H-alpha filter MUST NOT BE USED for solar observation!

Specifications

Guaranteed Transmission of more than 88% at the OIII Line (501 nm)
Typical Transmission of 92...95% at the OIII Line (501 nm)
Full-Width-Half Maximum (FWHM): 6nm
Perfect blocking of unwanted light from UV up to the IR
Parfokal with all Astronomik filters
MFR Coating technique: Usable with all optics up to f/4
Thickness of 1mm
Not sensitive to moisture, scratch resistant, not aging
Optically polished substrate, striae-free and free of residual stresses
High quality storage box

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Astronomik OIII 6nm Narrowband Filter

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