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Astronomik 31mm OIII-CCD 6nm

Astronomik 31mm OIII-CCD 6nm

can be shipped within 2-5 days

Price includes VAT, plus delivery

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 typically 96% the filter gives you an enormous contrast boost, as all unwanted light from other wavelengths than is blocked form UV up to the IR. This results in an extremly 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 starcrowded regions of the milkyway. 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.

Technical data:

Guaranteed Transmission of more than 90% at the OIII Line (501 nm)

Typical Transmission of 96% at the OIII Line (501 nm)

Full-Width-Half Maximum (FWHM): 6nm

Perfect blocking of unwanted light from UV up to the IR

Parfocal with all Astronomik filters

MFR Coating technique

Usable with all optics up to f/4

Thickness of 1mm

Not sensitive to moisture, scratch resistant, non aging opticaly polished substrate, striae-free and free of residual stresses

High quality storage box


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