Astronomik OIII 12nm CCD Filter 2In
product code: 8h00d0
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Astronomik OIII 12nm CCD Filter 2InThe Astronomik 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 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 501nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth
The FWHm of 12nm is optimised for typical DSLR cameras with CMOS sensors and CCD cameras with a normal/high dark current: With these cameras the background signal in images taken from heavily light polluted sites is dominated by the dark current of the sensor, not by flux coming from light pollution. In this case a further reduction of FWHM does not improve the image, as the background will not get darker. Compared to the 6nm filters you have more stars in the field of view which gives you more guiding stars when working with an integrated/dual guiding chip!
Due to the new MFR coating technique you may use one single filter on all instruments up to f/3 without a significant reduction in performance.
Guaranteed transmission of more than 90% of the OIII Line (501nm)
Typical Transmission of 96% at the OIII Line (501 nm)
Full-Width-Half Maximum (FWHM): 12nm
Perfect blocking of unwanted light from UV up to the IR
MFR Coating technique: Usable with all optics up to f/3
Optically polished substrate, striae-free and free of residual stresses
Not sensitive to high humidity or ageing effects
Excellent quality substrate, diffraction limited - the optical performance of your telescope will not be reduced
Parfocal with other Astronomik filters
1mm Glass Thickness
Supplied in a high-quality, long lasting, filter box
Imaging with Narrowband Filters
If you have to observe from light polluted sites (like most of us...), imaging with narrowband filters is the best way to take great images, as all kind of light pollution can be blocked very effective! Normally an H-alpha filter should be your first step into this amazing field of astrophotography! With an Narrowband H-alpha filter you will be able to take deep and contrasty images even with very heavy light pollution or with the full moon high up in the sky!
If you look at other astro-photos, an H-alpha is the best choice for all nebulas glowing red! An OIII filters expands your imaging possibilities, as you are able to image all greenish/blueish structures. Planetary nebulas and star forming regions are great targets! The SII filters completes your HSO-set of filters. With these three filters you are able to process your images like the ones from the Hubble space telescope!
Operation of the filter
The filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects glowing at the OIII line at 501nm.
Tips and Hints for more applications
Using the OIII filter together with H-alpha-CCD and SII-CCD filters you make produce false-color emission line images (HSO) in the same way as the Hubble-Space telescope. This is possible even from heavyly light polluted sites
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