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Antlia 3nm OIII Pro Astronomy Filter

£267.00✓ 2 year warranty

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About this product

Model: antlia_oiii_3nm_125
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Antlia 3nm OIII Pro Astronomy Filter

Antlia OIII Pro narrowband filter optimise the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia OIII 3nm Pro filters are designed to deliver 85% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Centre Wavelength (CWL) shift. We guarantee T>85% within 1nm range of the centre bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.

The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut off rate to minimise interference from other wavelengths. Improved sharp cut off astrophotography 3nm Pro filters are designed to minimise halos around bright stars.

IMPORTANT: These filters are NOT designed for observing or photographing the Sun. DO NOT use these filters to observe or photograph the Sun. If you do it will result in permanent eye damage!

FEATURES

3nm FWHM OIII filter - 500.7nm centre wavelength
High transmittance and smallest bandwidth to maximise contrast
Steep spectral profile minimises halos around bright stars
Suitable for imaging narrowband objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
Use in light polluted areas and dark sites
Extends imaging time when the moon is up
Suitable for fast systems down to f/3 without loss of signal
Edge blackened to eliminate internal reflections from stray light
2mm+/-0.05mm thickness for 1.25", 2" mounted, 31mm and 36mm unmounted
3mm+/-0.05mm thickness for 50mm and 50x50mm unmounted
Fine-optically polished on both sides

Transmission Chart

Blue Line - Represents the transmission curve of the filter.

The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)

The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)