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Optolong O-III 6.5nm Deep Sky Filter, Unmounted Round Disc with D-50mm

Planetary nebula remnants and supernovae show great structural details with a narrow band filter [O III], also visually!

♦ narrow band line filter (<=7nm) for lines of important nebulae

♦ preferred for CDD cameras with full frame transfer technology

♦ 2mm thick and therefore homofocal with many other Optolong filters

♦ Interference filter

♦ Frameless glass panel with a diameter of 50 mm

♦ optically polished

♦ Multi-layer hard coating - non-reflective and largely scratch resistant

♦ Images 2 and 4 are for demonstration purposes and therefore show the 1.25" filter and its cardboard packaging, respectively.

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Optolong O-III 6.5nm deep sky filter, 50mm diameter round disk

The OIII CCD 6.5nm Extra Narrow Band Filter is designed for observing nebulae with a bandwidth of only 6.5nm and a central wavelength of 500nm, which corresponds to the emission lines [O III]. Transmission at the other wavelengths is extremely low, particularly those radiating artificial light sources such as mercury vapor and both types of sodium vapor lamps, but also unwanted natural light emitted by neutral oxygen in the atmosphere (brightness of the sky).

O-III emits at 495.9nm and 500.7nm, so the filter appears blue-green when viewed through. Many images of planetary nebulae and supernova remnants were taken with only H-alpha and [O III] filters. They show great structural detail but have natural colors that make them look like an RGB shot.

Unlike H-alpha and [S II], [O III] is very well perceived with the naked eye, which means that this filter can also be used visually.

Main use and properties

♦ Suitable for photographing weak emission nebulae in moonlight or when there is a lot of light pollution

♦ By combining H-alpha, OIII-CCD and SII-CCD, narrowband recordings can be made in the so-called "Hubble palette", such as the famous "Pillars of Creation" (M16, Eagle Nebula).

♦ With the ability to shoot in moonlight and light pollution with line filters, your team won't sit idle for weeks out of the month.

♦ The OIII CCD filter is also suitable for visual observation of most diffuse nebulae, planetary nebulae, and some supernova remnants.

Substrate: High-quality optical glass from Schott
Thickness: 2.0 mm
Surface Treatment: Fine-optically polished
Surface Polish Quality: 60/40 (Refer to MIL-O-13830)
Surface Quality: 1/4 wavefront
Coating: Muti-coated
Cell: unmounted glass plate with 50 mm diameter
Typical transmission off-band: 0.1% (OD3)
Centre wavelength [O III]: 500 nm
FWHM [O III]: 6.5 nm
Typical transmission [O III]: 80%
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